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man Pages
All Linux and UNIX systems have a set of online documentation called the man pages – man for manual, naturally.
Some systems will also have other information sources and may have a viewer available from the GUI desktop.
Man pages are also being supplanted by newer sources of information, like info. There are often still referred to as man pages, though.
Use the man pages, often. In other words, RTFM.
“Read The Fine Manual”
Use this command to learn about using the man pages:
man man
Don't ask a question of your neighbour in the lab (or me) until you have checked the relevant man pages.