I guess my reply will be not so off topic, because it is precisely due to saint Alphonsus, one of my most beloved saints, that my faith grew more, and I learned more - I recommend his works. Very easy to understand, and really inspiring.
Books, websites, documents, films, EWTN, local Catholic Networks (in my case different country and language too), Catholic Answers podcasts, but I’d ask God in a prayer, what He wants you to know and guide you. Not only there’s a lot to choose from (which is why I love to read doctors of the Church and Church FAthers), there are also false teachers out there… And - after all, the most important book to read, EVER, is the Bible. I know you know, theoretically everyone knows, and yet sometimes one gets lost by reading volumes of theology or documents and then analyses of those documents, instead of just listening to Jesus, following Him, imitating Him, and loving Him.