You can put anything at all into a List(of T), that's what the T part is about, as it stands for Type. When you create the list, you say what type it will hold. In your case, it sounds like you are talking about paths, which are just strings, so a List(of string). They are just strings, just like eggs in an egg carton. Just because the egg is in the carton, it is still an egg.

As for deleting posts, that unlocks after some number of posts. I don't remember how many.