1. Controllers:

Are responsible for handling incoming requests and returning responded to the client.

3. Guards:
Is a class annotated with the @Injectable() decorator.
Guards should implement the CanActivate interface.

2. Modules:

Is a class annotated with a @Module decorator.   
Provides metadata that Nest makes user of to organize the application structure.

4. Middlewares:

Is a function which is called before the route handler.

5. Pipes:

Is a class annotated with the @Injectable() decorator.

6. Database:

Allowing you to easily integrate with any SQL or NoSQL database.  

CLI

npm  i -g @nestjs/cli

Use

nest new project-dominicode

1. Components:

Are the most basic UI building block of an Angular app.
An Angular app contains a tree of Angular components.

2. Modules:

A module is a mechanism to group components, directives, pipes and services that are related.

3. Guards: 

Interface that a class can implement to be a guard deciding if a route can be activated.

4. Pipes:

Get data, transform them, and show them to users.

CLI

ng add @nestjs/ng-universal