We have some great resources right here in this forum. Check out these two threads for lots of information:
CardsChat Learning Poker Thread Series Guide
CardsChat 30 Day Poker Training Course
Beyond this, if you are able to capture hand histories, posting them to
Cash Game Hand Analysis and
Tournament Hand Analysis will definitely help you advance your game. You can ask to have your play analyzed, or even ask specific questions about a hand (like, "Should I have folded here?", "Is my betting size appropriate here?", etc.). You can also review other people's hand analysis questions/answers and see if you agree with what has been discussed.