Cheat sheets have a bad reputation, because obviously cheating is wrong in many contexts.. But the actual process behind using a so called “cheat sheet” is actually quite handy. Because essential it is only a tool to enhance memory recollection and ease quick information access.
Found this website called Cheatography which essential has taken a number of different subjects and compressed essential information into a info-graphic / cheat sheet. This is very handy because of the small size and easy to read format. All the work has been done for you and you can find info on most subjects. For example, I am currently doing an online course on the Linux OS and I can use a cheat sheet from this website for useful command lines that I have to use. I printed it out and have it on my desk!
Hope this is of help to someone! But remember don’t use them to cheat;)