Who God is
There is nothing as important as to know who God is. Nothing will free you from the way you are living now as knowing who God is, not from a theological standpoint but from a relationship standpoint. Not a description of who God is, but an encounter with a living loving and totally involved God who knows everything about you and He is not upset with you, but instead has made a way for you to get to know Him. Don't listen to people that tell you who God is that has no relationship with Him, their understanding and knowledge is clouded by their own prejudice. They will be greatly terrified when they meet someone like the person they describe and very surprised when they meet God himself.