I usually watch a video after reading the rules and trying to play for a little bit. It usually helps cover the gaps in understanding or areas that I’ve misinterpreted the rules, while also allowing myself to become familiar enough with the game that I don’t get lost.
This is closer to my process. I give the rulebook a first pass, push some pieces around, and then I look for something like a 10min video that goes over turn actions in detail or exceptions to check my understanding of what I did when I was playing multi-handed. A trick I find that works well is to "build the world":
Look at components, what does each piece represent, what are spaces on a map, what is the nuance between similar spaces/pieces. Are there things listed on the board that are tracks or warnings or things like that.
What's a turn look like; how are actions selected, what actions are options, etc.
What special things do I need to be aware of
How does scoring function.
3 gets short shift before watching the video, but I do it this way because what they talk about in scoring makes little sense if I don't know what the components are, etc.