BeSharp

Hi there, first time poster So, I'm a constant guitar plateau-er! I've had many occasions in my years where i pick up the guitar, learn more chords, learn certain tabs and then seem to plateau! I've promised my self this year I'm trying to approach it differently, rather than play (easy) song by (easy) song (im very much a 'good' beginner!!), i'd like to get into the theory as much as I need. In terms of where I want to get, I'm interested exclusively in acoustic, possibly some classical (instrumentals only,can't sing!!). At the moment it feels daunting to learn it "properly", so trying to work out the best way... So, that said, theory, acoustic - cvan anyone suggest any decent resources (online, youtube, books etc) to get me started? Any ideas much appreciated!!