the mkdir command makes a directory folder.
the whatis command tells you what the command is.
the command alias is useful if you want to create a ‘shortcut’ to a command.
the command cp is used to copy files.
the command help tells you what the command is.
the command man ls shows you all the commands that can go with ls and a description.
the command mv moves a directory or folder somewhere else. I have moved directory to another directory.
the command rm removes a file or folder.