Thank you for sharing your thoughts. This confirms what I suspected/assumed.
Re:youtube, it's the same in my current domain (retouching) – lots of tutorials out there, but hard to gauge a tutorial's quality unless you already have some experience.
In the past, I've always had a methodical approach to learning things. I've started reading up terminology (which is similar yet different to the world of stills retouching – colour spaces, codecs, file formats). After that, I guess it's about understanding/being able to interpret scopes/waveforms (as opposed to just histograms/curves in the stills world),... and of course learning the software/shortcuts, and being able to efficiently use a panel.
Having had a play with DaVinci, I'm already fairly excited about what's possible... I've done some basic colour corrections for some stills images with Davinci, which would be a lot more complicated in Photoshop.
I'll definitely take a close look at the training websites you recommended, and also the membership/courses here on Lowepost.
Thanks again for your input!