I found the very basics quite difficult. ie, import a 5 minute video, trim beginning and end then save.
I have used a few other video editors over the years and worked out those steps more easily.
Once I got that sorted, things got much easier.
When you import a Video and get prompted to change video settings or not, that determines available frame rates etc that you will be able to export. That baffled me for a bit.
I have always been looking for an easy way to crop video. In most video editors crop is something very different to crop in Photoshop or other image editing software.
In DaVinci 'Zoom' crops as most stills people would call it. So for reach limited scenarios, take 4K video, then use 2.00 Zoom, then save as 1080P.
I can now add various clips, add different sound if needed, use levels - curves, shadow highlight, saturation etc.
You can just add JPEG anywhere you want and stretch it to any duration you ant for title screens etc
Also worked out how to separate sound from video track, so for editing Digital TV based clips that often end up with audio out of sync, fairly easy to shuffle sound back or forward to re sync. (right click in timeline and 'untick' 'link clips' to separate audio from video.)
The only video I ever watched, he was too quick and I could not understand one key word I needed to get started! So frustrating. Replayed it 10 times but just could not hear what he said.