Design is a very complex process. If you really want to achieve incredible results there are so many things to take into account when designing. Psychology, technical knowledge, history, physics are just some of the areas that you need to consider when working on that game changing design. It is physically impossible to get good at all of the mentioned fields so this is where cheat sheets are coming in.
In this post you will find some really useful design cheat sheets that will help you make design decisions quicker.