What Are Cheat Sheets? It is very difficult for a programmer to decorate all functions,classes and attributes existing in the various languages that use on a daily basis, so we use cheat sheets to have a reference of what we need time to program. It would be more or less on a physics exam at school, you can do all accounts but do not remember all that lot of complex formulas, so you use a "cheat sheet" with the formulas to be able to solve the exercises. For this there are cheat sheets are generally available in two formats: PNG and PDF. The cheat sheets available here, are not of my own, the credits are at the end. All of them are in the picture, PNG or JPG, as are the formats that most use for load faster.