How do you master Davinci Resolve?

Recently I've moved from Final Cut Pro, to Adobe Premiere and now with Davinci Resolve. It's super powerful and I'm enjoying it. I just wonder, does anyone know of some intermediate to advanced tutorials or courses I can sign up for? I would love to really dive deeper (pun intended) in colour grading, dynamic KeyFrames, power windows panel, etc. I also find underwater videos quite different from land-based videos so most of the tutorials on YouTube are a bit hard to follow (land-based videos)

What would I like to achieve? I would go up a few levels from basic colour grading like what I have here of some manta rays.

I shoot with a Sony A7V, most of the time with slog3. Any recommendations welcomed!

Edited 1 hour ago1 hr by Paulkzk
Adding some camera specs