If you navigate to the opensource.com/downloads/cheat-sheets page you can find some of the latest including the SSH and IRC cheat sheets.
At the top of that page, in the opensource.com Downloads menu, you will find even more cheat sheets such as ones for Networking, SELinux, AWK, Go, Python, Gnome, Gimp, and Raspberry Pi.
The opensource.com team is always looking for content, contributions, and contributors. If you have an idea for a cheat sheet - to write or just to use - let them know!
[editted after learning to spell]
A collaborative learning environment, enabling open source skill development.