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For the installation of  Angular on your local system,you need the following:

Node.js installation

Angular requires a current and active version of Node.js.

For more information on installing Node.js, you can  see nodejs.org. If you are not sure what version of Node.js runs on your system, run "node ---version" or simply "node -v"  in a terminal window.

npm package manager

Angular, the Angular CLI, and Angular applications depend on npm packages for many excellent  features and functions. To download and install npm packages, you need an node package manager. It  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 window.

Don't forget to confirm the installation by checking the version with command line interface : npm --version 

Install the Angular CLI
 Angular CLI  is used to create web based high scale  projects, generate application and library code, and perform a variety of ongoing development tasks like bundling,testing and deployment of web app.

                      img source: https://www.tecmint.com/wp-content/uploads/2019/07/Install-Angular-CLI-in-Linux.png

The first command npm install -g @angular/cli   installs the latest version of angular globally.

Check whether angular is installed or not with the command : 

ng --version

The second command ng new my-dream-app creates new project named my-dream-app

cd my-dream-app helps to change the directory to the project folder.

After that we can serve the project with command line : ng serve -o     i.e. Here -o helps to open the project in the default  browser automatically.

Just give it a try.