Usually what I do is writing these tricks down to a document that is easily accessible at a place where I know that I will look for when failing to remember them.

People had this same problem last century. They would use templates that fit over their keyboards with all the common shortcuts and commands printed on them. Sometimes they were for a specific program, but you could buy blank ones to write your own notes.

Today, "keyboard templates" have an entirely different meaning, so the best thing for this is paper. Print your shortcuts out on a piece of paper and put it near your monitor. You could even categorize them by writing them on different-colored Post-Its.