This is in some places a little bit specific to Lit but mostly not and walks you through that shift in mental models from start to finish that tends to trip people up a lot coming to Web Components https://youtu.be/Xt7blcyuw5s
FWIW if you are interested in Web Components I would say Lit is hands down the best entry point I’ve come across. Strong recommendation and nullifies most of the common complaints you tend to hear associated with them.
And here's an experiment I'm working on, where all styles are scoped to components because all static DOM trees become custom elements with their own shadow root: https://github.com/aalin/rdom
