When it comes to CSS, HTML or jQuery codes, you just can’t know them all. It’s pretty hard but with the help of these cheat sheet you can manage to get pretty close to knowing them all, considering that you have everything in from of you and it is easy to search. It is possible that a few of these cheat sheets have small differences between them but I still gathered them cause you might find easier to follow one of them and you need to have where to choose from.
I don’t believe there’s any surprise that when it comes to CSS and HTML, the cheat sheets presented here are about CSS3 and HTML5. It is normal to show the new ones instead of the old that you are already familiar with.