Understanding Composers and Components

Hey there. I’m new to Sage and it looks like a great way to build projects. I can’t quite get my head around the implementation of Composers and Components (particularly in instances where they might be used together). Are there any repos of example projects which demonstrate best practices? Many thanks!

In theme you have prepared one component Alert you can check there:
app → View → Componentes

And composers:
app → View → Composers

And as I can see in documentation details about composers and compontens was added:

and some older news in Roots blog:

Thanks @Jacek. I have looked through the documentation and the included examples. I’m more interested in seeing a build to establish context for implementation and see how others have used the tools.