Watch the The Thumb online guitar lesson by Stu Hamm from Stu Hamm U: Slap Bass

The first thing that you need to learn is to get a good, clean sound with your thumb.

In this segment I'll show you the correct area on the body of your bass the use, and at which angle you should strike the string with your thumb.

Take the time to really get a handle on the basics and learn how to produce a good tone, because this is MUSIC and at some point all that matters is how good it sounds!