Congratulations on making it through the first curriculum! The beginning of playing an instrument is the hardest, most frustrating part. You're on your way.
The next phase is StudyBass Fundamentals Two. In the next curriculum you'll learn about the most common scale patterns and, more importantly for bassists, chord patterns. You'll learn some basics about harmony. And lastly, we'll start on the blues--the roots of a lot of music and great musicians like you're going to be.