1.首先零基础学习前端先要有一个计划，了解前端要学习哪些技术。
2.做好自己的时间规划，如何快速入门前端那肯定是需要不断的提高自己的学习效率，学习过程中尽量把手机调至静音给自己一个安静的学习环境和氛围。
3.快速入门顾名思义肯定是少走弯路，在学习过程中看下自己身边有没有前端这方面的大神尽量多问，多交流，如果是没有的话，可以多去找一些前端的交流群，学习肯定是不能闭门造车。
学习是一个循序渐进的过程，前端的学习也是如此。
不论前端开发还是后端开发的学习都要求我们多动手，既要反复的看书，也把学习到的知识点第一时间去实践。前端的学习入门快要三个月，慢的要 5-6 个月左右，看个人的理解速度来评估，只要入门了不论理解能力，还是学习的速度都会有明显的提升。
在学习前端的过程中，除了要把学到的知识点第一时间去实践，也要在学习的每个阶段自己创建课题，用所学到的知识去实现课题的内容。这样可以更好有助于理解和累计一定的项目经验。
前端的学习从来不是孤军奋战，需要一个前辈的领路，也需要一个平台不断交流和思维碰撞。这样可以快速入门和少走弯路，也能让自己发现问题的根本所在。
阶段一
在学习前端之前呢，你需要一个编辑器，在网上你可以看到很多编辑器用来编写前端，甚至 Windows 系统默认的文本文档也可以作为前端代码的编辑器。俗话说，没有金刚钻怎么揽瓷器活，所以一个好的编辑器很重要，我在这里推荐给大家的编辑器是 VSCode。
思维导图
前端开发工具
一、HTML+CSS
前端的入门门槛是极低的，主要体现在 HTML 和 CSS 部分，运行环境就是浏览器，不像如 Java 需要配置开发/运行环境。
HTML 和 CSS 不是编程语言，HTML 是结构标签，CSS 是结构标签的样式配置。
HTML
属性
事件
标签
字符集
CSS
CSS基础教程
CSS样式
CSS框模型
CSS定位
CSS选择器
CSS高级
思维导图
HTML+CSS以上内容的学习用时 20天左右，再花 2 天的时间项目实践，这部分总花费时间在 22天左右。
二、HTML5+CSS3
HTML5 作为 HTML 的最新版本，引入了多项新技术，大大增强了对于应用的支持能力，使得Web技术不再局限于呈现网页内容。
HTML5 可以使开发者的工作大大简化，理论上单次开发就可以在不同平台借助浏览器运行，降低开发的成本，这也是产业界普遍认为 HTML5 技术的主要优点之一。
CSS3使用了层叠样式表技术，可以对网页布局、字体、颜色、背景灯效果做出控制。css3作为css的进阶版，拆分和增加了盒子模型、列表模块、语言模块 、背景边框 、文字特效 、多栏布局等等。
CSS3的改变有很多，增加了文字特效，丰富了下划线样式，加入了圈重点的功能。在边框方面，有了更多的灵活性，可以更加轻松地操控渐变效果和动态效果等等。在文字效果方面，特意增加了投影。
CSS3在兼容上做了很大的功夫，并且网络浏览器也还将继续支持CSS2，因此原来的代码不需要做太多的改变，只会变得更加地轻松。
HTML5
HTML5视频
HTML5音频
HTML5拖放
HTML5画布
HTML5 SVG
HTML5地理定位
HTML5 Web存储
HTML5 应用缓存
HTML5表单
CSS3
CSS3边框
CSS3背景
CSS3文本效果
CSS3字体
CSS3 2D转换
CSS3 3D 转换
CSS3 过渡
CSS3 动画
CSS3 多列
思维导图
HTML5+CSS以上内容用时 10 天左右，这部分内容是在 HTML+CSS 做的升级改进，只需要了解他们的一些特性即可，再结合这些特性做一些小项目加深学习。
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四、JavaScript
JavaScript 是 web 开发者必学的三种语言之一，这里我们需要区别 JavaScript 和 Java 他们是完全不同的语言，不论是概念还是设计。javascript 部分需要我们学习的知识点如下所示：
认识JavaScript
基本语法
变量
数据类型
字符串
数字
布尔
数组
对象
Null
Undefined
5. 函数
内置函数
自定义哈数
6. 运算符
7. 流程控制
8. DOM对象
String
Array
Date
Boolean
Math
Number
9. BOM对象
WIndow
Navigator
Screen
History
Location
10. 综合实例
思维导图
javascript以上内容的学习用时 35天 左右，这里推荐几本 Javascript 的书籍，如下：
《JavaScript 高级程序设计（第3版）》，俗称红宝书。前七章讲的是语言特性，是重点学习的部分，必须需要反复阅读，直至完全理解为止。DOM、事件流、表单、JSON、Ajax 与最后几章也需要重点学习，这是一些常用的 Web API。至于本书的其余部分大致读一下就可以，不做重点要求。
《JavaScript 语言精粹》，俗称蝴蝶书。很薄的一本书总页数就 147 页，花一天时间就能看完，快的话半天就能看完。这本书虽然很薄，但是承载的内容却非常的丰厚和深入。JavaScript是一门有很多坑的语言，所以这本书”取其精华，去其糟粕“就是精粹了。
《你不知道的 JS》非常精彩的一本书，将 JavaScript 的细节一网打尽。
阶段二
这部分内容是对 JavaScript 的补充学习
四、 Jquery学习
1. 基础语法
2. 选择器
基本选择器
层次选择器
过滤选择器
表单选择器
3. DOM操作
查找节点
创建节点
插入节点
删除节点
复制节点
替换节点
包裹节点
属性操作
样式操作
4. 事件
事件绑定
事件冒泡
5. 动画
show、hide
fadeIn、fadeOut
slideUp、slideDown
自定义动画animate
动画回调以及停止动画
6. 常用工具
浏览器及特性检测
数组和对象操作
Layer UI，主要学习栅格布局，图标，动画，按钮，表单，导航，选项卡，进度条，面板，表格，时间线等
7. Ajax
8. Jquery插件编写
思维导图
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二、其他
JavaScript 进阶
DOM+BOM综合演练
网页特效
ES6 进阶
bootstrap
animate.css学习
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以上内容的学习用时 10天左右
阶段三
这部分是框架和前后端交互技术的学习
一、Vue
Vue基础
模版语法
计算属性侦听器
Class与Style绑定
条件/列表渲染
事件处理
表单输入绑定
组件基础、注册
Prop
自定义事件
2. Vuex
State
Getter
Mutation
Action
Module
3. Vue-router
认识路由
动态路由
嵌套路由
编程式导航
路由组件传参
4. axios
认识axios
全局配置
发送POST、GET请求等
思维导图
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二、React
认识React
React元素渲染
JSX
组件
State
Props
事件处理
条件渲染
列表
组件API
组件声明周期
思维导图
三、Node
基础
console（控制台）
crypto（加密）
debugger（调试器）
fs（文件系统）
http（网络）
os（操作系统）
path（路径）
2. 高级
NPM介绍及使用
MVC模式简介
Express框架学习
链接Mysql
链接Redis
项目实战
思维导图
Node四、webpack
概念
主要讲什么是入口，出口，loader，插件等
2. 入口
单个入口语法
对象语法
常见场景
3. 输出
用法
多个入口起点
高级进阶
4. 模式
development
production
5. loader
实例
配置
6. 插件
剖析
用法
配置
7. 配置
基本配置
多个Target
使用其他语言配置
8. 模块
思维导图
webpack以上内容用时 两个月 左右
阶段四（扩展部分，了解即可）
一、Mysql
阶段一
认识mysql
安装mysql
创建数据库、数据表
学习常用的SQL命令，完成增删查改
2. 阶段二
学习Mysql关联查询，子查询等
学习Mysql常用函数
学习Mysql分组、分页、排序等
3. 阶段三
学习Mysql高级查询
了解存储过程，自定义函数等
了解Mysql配置文件
二、Redis
认识Redis
学习redis的数据类型
redis常用操作
redis事务
思维导图
数据库以上内容用时 7 天左右
阶段五
一、项目管理篇
SVN使用
认识svn
安装
生命周期
启动模式
创建版本库
检出操作
解决冲突
提交操作
版本回退
查看历史
分支
标签
2. GIT使用
认识git
安装配置
工作流程
工作区、暂存区和版本库
创建仓库
基本操作
分支管理
查看历史等
标签
github
二、扩展部分
小程序
1. 了解小程序开发流程
2. 视图容器
view
scroll-view
movable-view
cover-view
cover-image
3. 基础内容
icon
text
rich-text
progress
4. 表单组件
button
checkbox
form
input
label
picker
picker-view
radio
slider
switch
textarea
5. 导航
navigator
function-page-navigator
6. 媒体组件
audio
image
video
camera
live-player
live-pusher
7. 地图（map）
8. 画布（canvas）
9. 开放能力
open-data
web-view
ad
official-account
apicloud（移动app开发）
认识apicloud
开发工具讲解
端API
API对象
设备访问
功能扩展
界面布局
导航菜单
小程序模块
云服务对接
4. 云API
数据云API
统计云API
推送云API
云API SDK
5. 小程序模块使用
三、常用框架使用篇
iview （vue框架）
element ui （vue框架）
echarts (百度图标库)
阿里巴巴开源图标使用
Sass学习
Swiper学习
zoom.js 学习
四、综合项目实战
教务管理系统（node+express+mysql）实现
思维导图
扩展学习部分参考资料：前端学习路线，如何学习前端
在公元前，秘密书信已用于战争之中。西洋“史学之父”希罗多德（Herodotus）的《历史》（The Histories）当中记载了一些最早的秘密书信故事。公元前5世纪，希腊城邦为对抗奴役和侵略，与波斯发生多次冲突和战争。
于公元前480年，波斯秘密集结了强大的军队，准备对雅典（Athens）和斯巴达（Sparta）发动一次突袭。希腊人狄马拉图斯在波斯的苏萨城里看到了这次集结，便利用了一层蜡把木板上的字遮盖住，送往并告知了希腊人波斯的图谋。最后，波斯海军覆没于雅典附近的沙拉米斯湾（Salamis Bay）。
由于古时多数人并不识字，最早的秘密书写的形式只用到纸笔或等同物品，随着识字率提高，就开始需要真正的密码学了。最古典的两个加密技巧是：
1、置换（Transposition cipher）：将字母顺序重新排列，例如‘help me’变成‘ehpl em’。
2、替代（substitution cipher）：有系统地将一组字母换成其他字母或符号，例如‘fly at once’变成‘gmz bu podf’（每个字母用下一个字母取代）。
扩展资料：
进行明密变换的法则，称为密码的体制。指示这种变换的参数，称为密钥。它们是密码编制的重要组成部分。密码体制的基本类型可以分为四种：
1、错乱——按照规定的图形和线路，改变明文字母或数码等的位置成为密文；
2、代替——用一个或多个代替表将明文字母或数码等代替为密文；
3、密本——用预先编定的字母或数字密码组，代替一定的词组单词等变明文为密文；
4、加乱——用有限元素组成的一串序列作为乱数，按规定的算法，同明文序列相结合变成密文。
以上四种密码体制，既可单独使用，也可混合使用 ，以编制出各种复杂度很高的实用密码。
参考资料来源：百度百科—密码学
The United States Navy Sea, Air and Land (SEAL) forces are the elite Special Operations Forces (or Special forces) of the U.S. Navy, employed in unconventional warfare, foreign internal defense, direct action, counter-terrorism, and special reconnaissance operations.Navy SEAL teams and structure
SEALs carrying MP5 submachine guns
SEALs carrying MP5 submachine guns
SEAL teams are organized into two groups: Naval Special Warfare Group One (West Coast), and Naval Special Warfare Group Two (East Coast), which come under the command of Naval Special Warfare Command, stationed at NAB Coronado, California. As of 2006, there are eight confirmed Navy SEAL Teams. The original SEAL Teams in the Vietnam War were separated between West Coast (Group ONE) and East Coast (Group TWO) SEALs. The current SEAL Team deployments include Teams 1, 2, 3, 4, 5, 7, 8, and 10. The Teams deploy as Naval Special Warfare Squadrons and can deploy anywhere in the world. Squadrons will normally be deployed and fall under a Joint Task Force (JTF) or a Combined Joint Special Operations Task Force (CJSOTF) as a Special Operations Task Force (SOTF)
A SEAL Team has a Staff Headquarters element and three 40-man Task Units. Each Task Unit consist of a Headquarters element consisting of a Task Unit Commander (O-5), a Task Unit Senior Enlisted (E-8), a Targeting/Operations Officer (O-2/3) and a Targeting/Operations Leading/Chief Petty Officer (E-6/7). Under the HQ element are two SEAL platoons of 16 men (2 officers, 14 enlisted SEALs and sometimes 2 enlisted EOD Operators making a platoon of 18)a company-sized combat support staff (CSS) consisting of staff N-codes (the Army uses S-codes and the Marine Corps uses J-Codes)N1 Administrative support, N2 Intelligence, N3 Operations, N4 Logistics, N5 Plans and Targeting, and N8 Air/Medical. Each Task Unit can be easily split into 4 squads or eight 4-man fire teams for operational purposes. The size of each SEAL “Team” with Task Units and support staff is approx. 300 personnel. The typical SEAL platoon of 16 men has an OIC (Officer in Charge, usually an O-3), an AOIC (Assistant Officer in Charge, usually an O-2), a platoon chief (E-7), an LPO (Leading Petty Officer, E-6) and others ranging from E-6 to E-4 (most are E-5). Occasionally there is a "third O". Usually the third O is an O-1 on his first operational deployment. This makes the platoon consist of 3 officers and 13 enlisted personnel. The core leadership in the Task Unit/Troop and Platoon are the Commander/OIC and the Senior Enlisted NCO (Senior Chief/Chief).
Task Unit core skills consist of: Sniper, Breacher, Communicator, Maritime/Engineering, Close Air Support, Corpsman, Point-man/Navigator, Primary Driver/Navigator (Rural/Urban/Protective Security), Heavy Weapons Operator, Sensitive Site Exploitation, Air Operations Master, Lead Climber, Lead Diver/Navigator, Interrogator, Explosive Ordnance Disposal, Technical Surveillance, and Advanced Special Operations.[citation needed]
Each team is commanded by a Navy Commander (O-5), and has a number of operational SEAL platoons and a headquarters element. In 1987, SEAL Team 6 was renamed to the United States Navy Special Warfare Development Group, although members are still frequently referred to informally as "SEAL Team 6". Naval Amphibious Base Little Creek, a naval base in Virginia Beach, Virginia, is home to SEAL Teams 2, 4, 8 and 10.
There are also two SDV units, SDVT-1 located in Pearl Harbor, HI, and SDVT-2 in Virginia. SDV Teams are SEAL teams with an added underwater delivery capability.
[edit] Training
Entering training to become a Navy SEAL is voluntary. Anyone can volunteer, and officers and enlisted men train side by side. In order to enter SEAL training, however, they do have to meet certain requirements. Those wishing to volunteer for SEAL training have to:
* be an active-duty member of the United States Navy
* be 28 or younger (although waivers for 29- and 30-year-olds are possible)
* possess uncorrected vision no worse than 20/40 in one eye and 20/70 in the other eye correctable to 20/20 through contacts or glasses (corrective surgery PRK is also possible), there are waivers for colorblindness
* be a U.S. citizen
* pass the Armed Services Vocational Aptitude Battery (ASVAB) test
Underwater Demolition Team jumps over the side from boat.
Underwater Demolition Team jumps over the side from boat.
SEALs in woodlands operation.
SEALs in woodlands operation.
SEAL recruit training has these components, lasting 48 weeks (or 11 months):
* 25 weeks Basic Underwater Demolition/SEAL (BUD/S) training at the Naval Special Warfare Center in Coronado, California near San Diego.
* 1 week of static line jump training, followed by 3 weeks of Military Free Fall (MFF) Qualification training at Tactical Air Operations in Otay, CA.
* At Coronado, 19-week SEAL Qualification Training (SQT).
After this, the trainee is officially named a SEAL.[1]
[edit] Screening
Assignment to BUD/S is conditional on passing the PST, which requires the following minima:
* 500-yard (457 m) swim using breast or side stroke in under 12:30
* At least 42 push-ups in 2 minutes
* At least 50 sit-ups in 2 minutes
* At least 6 pull-ups from a dead hang (no time limit)
* Run 1.5 miles (2.4 km) in running shoes and shorts in under 11:00
* Members’ vision must be no worse than 20/200 in both eyes. Vision must be correctable to 20/20. SEAL candidates may qualify for PRK surgery to correct their vision
Again, the above are the minimum requirements necessary to qualify for BUD/S. Prospective trainees are expected to far exceed these minimums. Competitive scores are as follows:
* 500-yard swim using breast or combat side stroke in 10:00 minutes
* 79 push-ups in 2 minutes
* 79 sit-ups in 2 minutes
* 11 pull-ups from a dead hang (no time limit)
* Run 1.5 miles in boots and long pants in 10:20
[edit] Selection (BUD/S)
Upon arrival at Naval Special Warfare Command, check-ins for BUD/S are immediately placed into a pre-indoctrination phase of training known as 'PTRR', or Physical Training Rest and Recuperation. PTRR is also where all of the 'roll-backs' are placed while waiting to be put into a class. Once additional medical screening is given, and after enough BUD/S candidates arrive for the same class, organized physical training begins.
BUD/S consists of a five-week 'Indoctrination Course', known as INDOC, followed by three phases, covering physical conditioning (eight weeks), diving (eight weeks), and land warfare (nine weeks) respectively. Officer and enlisted personnel go through the same training program, and it is designed to develop and test their stamina, leadership and ability to work as a team.
In the first phase BUD/S students are divided into 'Boat Crews' which can consist of six to eight men. However, although some exercises will be undertaken as boat crews (such as 'log PT', which requires boats crews to exercise with logs that weigh 150 pounds (68 kg) each, and 'Surf Passage', where boat crews must navigate the Pacific surf in inflatable boats), the first phase of BUD/S also consists of a series of demanding individual physical tests including frequent sets of push-ups and sit-ups, ocean swims and timed four mile (6.4 km) runs in boots and long trousers, in soft sand (to be completed in 32 minutes). The first phase is most well known for 'Hell Week', which usually occurs duritly drop on request (DOR), from the course. The tradition of DOR consists of dropping one's helmet liner next to a pole with a brass ship’s bell attached to it, and ringing the bell three times (the bell was taken away for a few years in the 1990's...then later brought back). Classes typically lose around 70–80% of their trainees — either due to DORs or injuries sustained during training, but it is not always easy to predict which of the trainees will DOR during BUD/S. Winter class dropout rates are usually higher due to the cold. SEAL instructors say that in every class, approximately 10 percent of the students simply do not have the physical ability to complete the training. Another 10–15 percent will definitely make it through unless they sustain a serious physical injury. The other 75–80 percent is 'up for grabs' depending on their motivation. There has been at least one BUD/S class where no one has completed the program. Most trainees are eliminated prior to completion of Hell Week, but trainees will continue to DOR in the second phase or be forced to leave because of injuries, or failing either the diving tests or the timed runs and swims. In fact, the instructors tell the students at the very start of BUD/S that the vast majority of them will not successfully complete the course and that they are free at any time to drop out (via the bell) if they do not believe they can complete the course. A trainee who DOR's from First Phase before the completion of Hell Week and reapplies to the BUD/S program must start from the beginning of INDOC (if they are accepted). Any BUD/S trainee who drops on request after Hell Week goes through the same out-processing as a trainee who quits before or during Hell Week. If they reapply to BUD/S they would stand a very good chance of being accepted, but they must complete Hell Week again. However, those who have completed Hell Week, but cannot continue training due to injury are usually rolled back into the next BUD/S class after Hell Week, or the respective phase in which they were rolled. There are many SEALs who have attempted BUD/S two or even perhaps three or more times before successfully completing training. There is only one person who has successfully completed Hell Week three times. He completed training after his third application to BUD/S[citation needed].
[edit] Qualification
After BUD/S Selection students attend SEAL Qualification Training (SQT) which is the NEC 5326 awarding schoolhouse of NSW. SQT is an arduous 6-month program consisting of the basic skillsets required to join a SEAL Team. The operators attend a sequential course consisting of: TACAIR (static line and Freefall), SERE, Tactical Medicine, Communications, Cold Weather/Mountaineering, Maritime Operations, Combat Swimmer, Land Warfare (small unit tactics, light and heavy weapons, demolitions), and Close Quarters Combat.
Upon completion of SQT the students are awarded the Navy SEAL Trident, assigned to a SEAL Team and are deployable.
[edit] Sustainment (PRODEV/ULT/SIT)
Upon assignment to a team, the new SEALs will be assigned to a Platoon as an Operator. Once in a Task Unit/Platoon, the Operator will train for an 18-month period (work-up) before a six month active deployment which is followed by six month 'stand down' period. After this has been completed, they are officially considered SEALs.
Phase One of a work-up is called the Professional Development Phase (PRODEV). PRODEV is a 6-month block where Operators gain critical skills required by the Task Units/Platoons for deployment. Operators can expect to acquire the following core skills:
* Sniper
* Breacher
* Surreptitious Entry
* Electronic and Media Exploitation
* Technical Surveillance
* High Threat Protective Security (PSD)
* Advanced Weapons Training
* Advanced Driving Skills (Urban/Rural/Security)
* Advanced Climbing/Rope Skills
* Advanced Air Operations: HALO/Jumpmaster/Parachute Rigger and Packer
* Diving Supervisor
* Range Safety Officer
* Instructor School
* Leadership School
* Foreign Weapons
* UAV Operator
* Language School
* Advanced Special Operations
Phase Two of a work-up is called Unit Level Training (ULT). ULT is a 6-month block where the Task Units train in their core mission areas (Land Warfare, Close Quarters Combat, Urban Warfare, Maritime Interdiction, Combat Swimmer, Long Range Interdiction, Air Operations, Special Reconnaissance and Maritime Operations, Advanced Marksmanship/Heavy Weapons).
Phase Three of a work-up is called Squadron Integration Training (SIT). SIT is the last 6-month block where the Task Unit conducts advanced training as well as integrates all supporting attachments (N-codes (N1-N8), Special Boat Squadrons, Medical Teams, EOD, Interpreters, Intelligence/HUMINT Teams, Cryptological Support Teams, etc). A final Certification Exercise is conducted with the entire SEAL Team to synchronize Task Unit operations under the Task Group umbrella. Following CERTEX, a SEAL Team becomes a SEAL Squadron and deploys to the area of operations for 6-10 months. The Task Units will be assigned an area of operations and work under a Squadron Headquarters Unit called a Task Group.
[edit] Area of operations
Navy SEAL team member fires an M60E3 from the shoulder during a field training exercise in 1987.
Navy SEAL team member fires an M60E3 from the shoulder during a field training exercise in 1987.
[edit] Deserts
SEAL operators must be ready for desert deployment especially with the current Iraq and Afghanistan wars. Long distances in the desert environment are travelled in Humvees or Desert Patrol Vehicles. The harsh desert environment provides little to no concealment, so blending in is more difficult.
[edit] Arctic
Arctic missions can call for a lot of equipment and skill. The SEALs layer their clothes, travel by night, sleep in snow caves and carry 3 lines of gear and often pull a sled. The First Line gear includes: survival gear, including signaling device, emergency rations, spare parts, E &E kit, map &compass, flashlight and the side arm. Second Line gear includes equipment carried on the operator's web gear, including primary weapon and ammo, short-term supplies (should the rucksack be ditched), grenades, water, med kit, smokes, flares, carabiners and other miscellaneous gear. Finally, the operator's Third Line of gear includes that equipment stored in the rucksack, including sleeping bag, ground pad, tent, food for the duration of the operation, gas stove &utensils, dry socks, clothing layers and a water container. Mountaineering gear will also be divided among the squad and carried with the third line, and each member will carry his personal ice ax and snowshoes attached to his rucksack. Other Arctic operations include extreme cold water diving, kayaking, skiing, and snowmobiling.
[edit] Woodland/jungle
The woods and jungles are difficult to maneuver in. In the jungles SEALs will typically carry a machete to clear foliage quickly and easily and a shotgun for close combat. Patrols in the jungle will normally take longer than usual because of the difficulties in maneuvering.
[edit] Mountaineering/climbing
An operator will carry his climbing gear in the third line rucksack for use if and when needed. The common gear, such as ropes and carabineers, are split among the squad to distribute the weight among the Team. Each individual will carry his own sit harness.The lead or point climber is the most experienced climber in the squad. He will climb the face free of any protection (i.e.: chalks, pitons, top rope etc.) and set the route. Once at the top he will anchor a top rope and let it down to the squad below. He will then set security while the climbers ascend the rope. A belay man will assist from below or above depending on the type of climb. The gear will be hauled up on a Jumar along with the climber. This is dangerous work and emphasis is on speed and stealth. The lead relies on his strength and free climb training and experience to find the best route in the darkness.
[edit] Sea
SEALs can insert, extract, and perform underwater attacksthis is what distinguishes them from other Special Operations Forces. The SEALs have a variety of equipment and water crafts that help them perform water missions. (see: SEAL Delivery Vehicle, Advanced SEAL Delivery System)
[edit] Air
SEALs utilize several different forms of insertion from the air. Static Line and Free Fall Parachuting, Fast-Rope and Rappel Operations, or simply jumping out of a helicopter into the ocean with a Zodiac inflatable raft. SEALs are also extracted by air transportation on occasions. Also SEALs are inserted into missions through a free-fall technique known as HALO (High Altitude Low Open) where they jump from as high as 35,000 feet and open their parachutes at about 3,000 feet. In most clandestine missions requiring air insertion, however, they arrive by way of HAHO (High Altitude High Opening) drops, normally opening at 10,000 feet. This helps the drop plane to evade detection by releasing the team as far as 30 miles before the target area. This form of insertion is also undetected by enemy radar.
