You might want to get "Bash Guide for Beginners"---free at tldp.org.
Also, try "info coreutils" in a terminal.
AND: "man -k keyword" This finds all the man pages containing the keyword. (But I just ran it and it did not find "mkdir"!!!???...hmmmm)
OK:
"man -k directories" finds mkdir..... as does "man -k director*"
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