As you say, that does mean the learning curve is pretty steep, but it's not as bad as some professional grade software. I was able to get to a point of being able to do some basic video editing/export with it in a few hours of watching YouTube videos and reading documentation. By no means am I an expert but I really appreciate that this is actually software designed to get out of your way and allow focusing on the task at hand without constant popups asking if I've tried some feature I don't have any interest in.
Funny, that's how I think of easy/beginner modes: "in the way, preventing me from getting something done".
Have you read the beginners guide? https://documents.blackmagicdesign.com/UserManuals/DaVinci-R...
At 643 pages it's surprisingly short for how many subjects it introduces. Going further you'll of course want to read In the Blink of an Eye.(978-1879505629) and the Color Correction Handbook (978-0133435542).
And the actual Resolve manual is also really really good. https://documents.blackmagicdesign.com/UserManuals/DaVinci_R...