Well there are 2 Angular versions: First is AngularJS and other is Angular2+.

In this tutorial series we will see the power of Web Apps made by Angular and leverage it.

This post will show you how to install and run your first HelloWorld App with AngularS

Getting started

Welcome to Angular! Angular helps you build modern applications for the web, mobile, or desktop.

This guide shows you how to build and run a simple Angular app. You’ll use the Angular CLI tool to accelerate development, while adhering to the Style Guide recommendations that benefit every Angular project.

This guide takes less than 30 minutes to complete. At the end of this guide—as part of final code review—there is a link to download a copy of the final application code. (If you don’t execute the commands in this guide, you can still download the final application code.)

Prerequisites

Before you begin, make sure your development environment includes Node.js® and an npm package manager.

Node.js

Angular requires Node.js version 8.x or 10.x.

• To check your version, run node -v in a terminal/console window.
• To get Node.js, go to nodejs.org.

npm package manager

Angular, the Angular CLI, and Angular apps depend on features and functionality provided by libraries that are available as npm packages. To download and install npm packages, you must have an npm package manager.

This Quick Start uses the npm client command line interface, which is installed with Node.js by default.

To check that you have the npm client installed, run npm -v in a terminal/console window.

Step 1: Install the Angular CLI

You use the Angular CLI to create projects, generate application and library code, and perform a variety of ongoing development tasks such as testing, bundling, and deployment.

Install the Angular CLI globally.

To install the CLI using npm, open a terminal/console window and enter the following command:

content_copynpm install -g @angular/cli

Step 2: Create a workspace and initial application

You develop apps in the context of an Angular workspace. A workspace contains the files for one or more projects. A project is the set of files that comprise an app, a library, or end-to-end (e2e) tests.

To create a new workspace and initial app project:

1. Run the CLI command ng new and provide the name my-app, as shown here:content_copyng new my-app
2. The ng new command prompts you for information about features to include in the initial app project. Accept the defaults by pressing the Enter or Return key.

The Angular CLI installs the necessary Angular npm packages and other dependencies. This can take a few minutes.

It also creates the following workspace and starter project files:

• A new workspace, with a root folder named my-app
• An initial skeleton app project, also called my-app (in the src subfolder)
• An end-to-end test project (in the e2e subfolder)
• Related configuration files

The initial app project contains a simple Welcome app, ready to run.

Step 3: Serve the application

Angular includes a server, so that you can easily build and serve your app locally.

1. Go to the workspace folder (my-app).
2. Launch the server by using the CLI command ng serve, with the --open option.

content_copycd my-app
ng serve --open

The ng serve command launches the server, watches your files, and rebuilds the app as you make changes to those files.

The --open (or just -o) option automatically opens your browser to http://localhost:4200/.

Your app greets you with a message:

Step 4: Edit your first Angular component

Components are the fundamental building blocks of Angular applications. They display data on the screen, listen for user input, and take action based on that input.

As part of the initial app, the CLI created the first Angular component for you. It is the root component, and it is named app-root.

1. Open ./src/app/app.component.ts.
2. Change the title property from 'my-app' to 'My First Angular App'.src/app/app.component.tscontent_copy@Component({ selector: 'app-root', templateUrl: './app.component.html', styleUrls: ['./app.component.css'] }) export class AppComponent { title = 'My First Angular App!'; }The browser reloads automatically with the revised title. That’s nice, but it could look better.
3. Open ./src/app/app.component.css and give the component some style.src/app/app.component.csscontent_copyh1 { color: #369; font-family: Arial, Helvetica, sans-serif; font-size: 250%; }

Looking good!

Final code review

You can download an example of the app that you created in this Getting Started guide.

Tip: Most Angular guides include links to download example files and run live examples in Stackblitz, so that you can see Angular concepts and code in action.

For more information about Angular project files and the file structure, see Workspace and project file struture.