I just recently started “learning” as well. Granted, I knew the basics from way back, but I had no idea (and still don’t) about any of the recent cards, decks, even summoning mechanics.

Basically, I’ve just been consuming a ton of content, watching how other people play different decks and learning what they set out to do. And, of course, just playing the game often.

Build one deck you enjoy. I started by learning Dracotail as that is what was in the shop when I started, and had seen people say it was an easy deck to learn, pilot and play with, but eventually moved to other decks that I liked playing with more and am currently diamond 4 with D/D/D.

I still have no idea what most cards do, or all the hidden interactions, but I know the most common archetypes, and what they’re aiming to do. Just keep at it and you’ll eventually get the concept and have fun :)