Usually, there are countless of different tools and languages involve in web development. And as web developers, we will always be moving from one to another along the way, which is why it is almost impossible to memorize all the things like the hot keys and functions for each.
That is where a cheat sheet come in handy. Cheat sheet is usually a small printable sheet that contains brief notes and references. Although using a cheat sheet is prohibited during our school exam, it is on the contrary is incredibly useful in web development.