https://angular.dev/reference/configs/file-structure
When you first create a angular project, the file structure looks like this:
For official descriptions, visit https://angular.dev/reference/configs/file-structure#application-project-files.
Components: Foundational building blocks; https://angular.dev/tutorials/learn-angular/1-components-in-angular;
Contains three parts: Typescript class, HTML template and CSS Styles.