Re: Deleted folders from /home/user/
Yes, without knowing what you've deleted, "mkdir ~/folder_name" is all we can really suggest.
Most important folders should be automatically recreated when you log in. Otherwise, have a look in /etc/skel, which contains the default files and folders that are put into a new home directory when a new user is created. Also make sure that the folders listed in ~/.config/user-dirs.dirs exist.
If they're your own folders, you'll just have to rely on your memory...