Be sure to check out lesson #522 where I map out go-to Travis fingerstyle patterns you can use for all the common chords.
There’s a handy PDF cheat sheet available with that lesson, as well! It includes some of the most common filler note patterns for each chord too, which I’ll teach in the next module. I plan on creating a new PDF similar to this one, focusing on only bass notes — so stay tuned for that. But in the meantime, I trust this lesson & PDF will help.