When creating a new Angular project using the Angular CLI, you might encounter a prompt asking whether you want to enable Server-Side Rendering (SSR) and Static Site Generation (SSG/Prerendering). This prompt is part of the Angular Universal schematics, which provides support for Server-Side Rendering in Angular applications.

If you choose to enable Server-Side Rendering (SSR) during the project setup, Angular Universal will be configured to render your Angular application on the server. This can improve the initial load time and SEO of your application by serving pre-rendered HTML to the client.

Static Site Generation (SSG) or Prerendering, on the other hand, involves generating static HTML files for your application at build time. This can further improve performance by serving pre-rendered static content to users.

How to choose: If you have SEO requirements or need better initial loading performance: Consider enabling SSR (Server-Side Rendering) and SSG (Static Site Generation). If your application is more dynamic and doesn't require SEO optimization: You can choose not to enable SSR and SSG.