What should I know about GIT?

What should I know about GIT?
Source control
Branching
Merge
Rebase
Cherry pick
Stash
Tag
Etc.

Why I should use Typescript?
Less bugs
Development performance
Features: type checking, autocompletion, source documentation and etc.
Responsive support from the Typescript team
Starts and ends with JavaScript
Beautiful and elegant
Etc.

Getting started
https://nodejs.org/en/
npm install -g typescript (or install locally in dev dependencies)
tsc helloworld.ts

How to compile
tsc helloworld.ts
tsconfig.json

Settings
target
removeComments
outDir
sourceMap
outFile
files
Etc.

Variables
Use ES6 let and const to declare variables in Typescript.
let user: User = new User();
const cardNumber: string = “**** **** **** 1111”;

Types
boolean
number
String
Object
Array
Tuple
enum
null
undefined
void
never
any

Type declaration
declare type primitive = number | string | boolean| null | undefined;

Type conversion
variable;
as

What should I know about classes in TS?
fields
methods
constructor
static fields and methods
private/public/protected
get/set
readonly

Inheritance and abstract classes
basic inheritance mechanism in general the same as in ES6
abstract class can’t be instantiated
but more concrete implementation can be
example: abstract Figure, concrete Square and Circle.

What should I know about interfaces in TS?
syntax
optional and readonly properties
implementation
Interface inheritance
Function and array interfaces

Generics
Use generics when something should work with any data types.
You can use them with functions, classes, interfaces.
Example: promisify, Map class.

Namespaces
Namespaces contains a group of classes, functions, interfaces, variables, other namespaces, etc.
Use namespace to declare namespaces.
Use exports for using entities in other namespaces.

Modules
TS support the following modules:
AMD (Asynchronys Module Defenition)
CommonJS
UMD (Universal Module Defenition)
System
ES 2015
Use export/import features.
Example: User and UserService

Decorators
Allow to add metadata to classes or their members for changing their behavior without changing their code.
Decorator – function, which can apply on class, field, methods, getter, setter, parameters, etc.
Set experimentalDecorators: true for using decorators.