I've been playing semi-pro bass since 1988, previously classically trained on upright and played in an orchestra, as well as played guitar full-time pro in the '70s, and if there's one thing I've learned is that I don't do things just like everybody else does, or the way they say it should be done. Take the suggestions you get here and check them out, but ultimately the choice is yours as to what really works for you.
For instance, I do the floating thumb technique, but not the standard version. My thumb ends up floating along the outside edge of the E-string (4-string). It's even made a track on the pickguard of my Jazz Bass. But, sometimes I'll anchor on the front pickup, sometimes even on the end of the fingerboard when I want a deep sound. Seldomly do I anchor on the bridge pickup, but I might once in awhile. It's all about the tone I'm after.
How did I learn this stuff? Easy, I just played and let my body do what felt natural. maybe a teacher coulda gotten me through a few stages quicker, I dunno. Well, he did as far as upright goes, but I've had no lessons on electric.
My point is, don't take a piece of advice as if it were written in stone, like it is the ONLY thing to do. Don't get me wrong, though, all the advice you're getting here is good stuff from good folks. I'm just saying don't forget to feel out what works best for you as an individual. And, sometimes you just have to let it happen rather than try to make it happen.