FreeBSD cheat

https://www.freshports.org/misc/cheat

 

sudo opkg install cheat

using the command line: install misc/cheat -- it comes with a bunch of examples on most used commands.
man pages describe the workings of commands, misc/cheat gives and collects your own examples. otherwise just search the internet for examples. write them down in a notebook or collect them in misc/cheat.

 

source: https://forums.FreeBSD.org/threads/some-books-materials-for-getting-started-with-freebsd.90536/post-624410