The commands you want to know about are "mv" to move or rename a file, "cp" to copy a file, and "mkdir" and "rmdir" to create and remove directories, aka folders. If you want to create an empty file, you can use the "touch" command, as in "touch myfile.txt". You could also use "echo >myfile.txt".
Look at the manual (man pages) for a given command with the "man" command, e.g., "man cp".