Here's a very useful CLI cheat sheet for Linux, which will show most of your commands and simple usages. Probably not the easiest to use when you're not working on a native 1280*1024 resolution, but it doesn't take much to change that.
Found it on several places, not sure who originally made it and deserves credit: A Linux wallpaper for beginners, korben.info and CLI Cheatsheet.
Linux Wallpaper -- CLI Cheat Sheet
It's a good summary of most vital linux commands.