If you don’t remember the command that you need, you can type a keyword with “apropos” about what you want to do. Then, all commands related to the keyword will be displayed.
Display the manual page of a given command.
Reads documentation and gives more detailed information about a command then man pages do. “info” also allows navigation and links between pages.
Display short manual page descriptions.
5. — help :
Displays summaries of built-in commands.