Have not viewed any videos. Sorry. Personally, I derive much more benefit from tinkering.
I generally set out with a specific UI (layout and behavior) that I need and then try to create it using various approaches. There’s often more than one way to achieve a given layout for a specific screen width, but each might respond differently at other widths.
That said, as you noted, it’s beta software, so things will evolve and improve. The best we can do at this point is provide feedback and submit bug reports.