This guide takes you through every step of the CFOP speedcubing method. You want a taste of the high-flying, rock and roll lifestyle of the speedcuber. You want to be one of those people, who can just look at a cube, and ten seconds later boom, it's done. You aren't satisfied with people standing around for 2 minutes while you solve it because that guy at the office didn't believe you.
Maybe you're even getting pretty good, and can consistently do it in under 2 minutes. So you've gone through the beginner's method a few times, and maybe you can solve the cube unaided every time.