Why and how does it work? I have a more logical mind and I want to understand how.

Astrology makes sense to me more but tarot? It's just so disorganized and chaotic. IDK lol. Can anyone recommend me a book that explains the whole journey process (I heard Roseology explaining this in her readings but never really looked into it) Can anyone give me resources about its structure and the whole system or something? I stumbled upon this January 2020 and until now, lol I'm lost.