In this video, I show you how you should develop your thumbing technique, which is the first Slap Bass Lesson that I teach to students who want to learn how to play slap bass. Having this kind of foundation is critical before moving on to more complex and advanced techniques.

Practice the exercise in the video until you can thumb evenly and accurately across all the different strings, making sure every string is ringing out loudly and that you're not hitting other strings you didn't mean to hit.