No matter how much you’ve worked with canvas, you could always use a little reminder all those attributes and methods you don’t use everyday. The canvas cheat sheet is a great thing for exactly that.
It’s a quick reference sheet that covers working with paths, pixel manipulation, line style, and lots more from Jacob Seidelin. It’s a whole lot easier to read than the WHATWG specs and it comes in two handy formats: PDF and PNG. Bookmark it and keep it handy for later!