Feel free to browse and traverse your computer from your terminal application. You can create files and folders, but beware when you delete, especially folders - whatever is deleted from the command line (the terminal application) is gone for good.

Moving around is easy and harmless - there is literally nothing you can break with it.

Creating files and directories are harmless as well - worst case scenario you leave some "trash" behind.

Delete with care! This is a real delete, not the user-friendly one provided by your OS, where first your stuff is not deleted, only moved to another folder, named "trash"...