"Components are the main building blocks of Angular applications. Each component represents a part of a larger web page. Organizing an application into components helps provide structure to your project, clearly separating code into specific parts that are easy to maintain and grow over time." - Angular Docs
To add a component to this project use the following command
ng generate component <Component name and path here>
and edit the files it generates to your hearts content. You will then be able to use the component wherever you want in the HTML files.