One of the skills that every good motorcyclist has to master is rev matching. Rev matching occurs during downshifts. Basically, you try to match the engine speed and wheel speed so that when you shift down to a lower gear you don't have engine braking and the gear change occurs smoothly.
In order to do this right you need to blip the throttle, work the clutch, and downshift all at precisely the right time. Each bike will be a little different and it this is a skill that will take some time to master. But, man, when you get it right, you get a silky smooth downshift and you can just power on through a turn like nobody's business.
In order to get good at this, you need to do it all the time. You can practice this any time you come into a turn and have to slow down. The next time you ride, make a point to blip the throttle and smooth out your downshifts at each applicable turn. It'll take a while, but in the end, you'll be a better rider for it.
What to learn more about rev matching? Check out this article on Motorcyclist Magazine's Street Savvy blog.