Linux has an extensive set of online documentation for your reference. They're referred to as manual pages, as in reading the manual. The abbreviated command for referencing this documentation is, man command, and a screen-full of information appear before you.
It's easy to navigate man pages. Use the Enter key to advance one line at a time, the 'b' key to go back, the Space bar to advance a full-screen page, and the 'q' key to exit the man page. As an example, look at the man page for the ls command.
man ls
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