Composer question

So, let me repeat it just to see if I understood it right.

The brain of the framework is in the vendor folder so it can be updated but the app itself is living in the app folder. And the way to make sure the app runs from the files in the so folder is by namespacing it and/or extending the classes from the vendor.

That means that if I update via composer, I'll still have to check if some of the files are up to date? For example, if you update something in the (i don't know the path bc i am writing from phone)/Views.php, that would be updated, but if you change the BaseController.php, it would have no effect on updating as I would have to do it manually.

Thanks a lot for the explanation and keep it up!