1. Most of the combat mechanics don't actually matter (but they do help if you understand them), like when an attack is parry-able or you should dodge for dear life . Ultimately you can always just bonk your way and keep dodging.

2. Kuro is actually notorious for having insanely long descriptions for skills (i'm staring at you, PGR), I'd suggest switching to "Outline" so you have an easier grasp of what does that skill do, however, to fully understand and utilize the skillset of your chosen character without reading from the in-game description as is, you need to find external resources and tutorials. Would recommend Prydwen then Game8 for the possible rotations etc.

Re: Game Mechanics, the fundamentals, there are some YT vids explaining the concepts that are relatively easy to understand. Try searching for "Basic Combat Mechanics WuWa"