How do I tighten the gears on my bike?

Periodically, the gears on my bike get loose, and the gears don't change as well. When I take it in to the bike shop, the guy fixes it in two minutes. Is there an easy way to do this at home. I know it involves the screws near the actual gear shift, but I'm not quite sure on how to do this properly.

Johntron8 years ago
You can probably find anything you need to know about maintaining a bike on, the site of the late great Sheldon Brown. Here's a link to the Gears and Drivetrains section: