So, music theory is like chinese for me. Can any of you reccommend books that would teach me from very basic music theory to intermediate or even advanced. I'm slow, so the book has to be kinda' simple and easy to understand but still teaches you everything and doesn't miss out on anything.

Any help is appreciated and thanks a lot in advance
I would reccomend the "idiot's guide" to music theory or also the idiot's guide to compositon. both worked wonders for me, and they're relatively cheap