Hey, started playing about a month ago, I ran pretty good at nl2 crushing hard, now I've played about 20k hands on nl10 and I'm completelly break even. What I've realised is my red line went from horizontal to quite downwards.
My take on it is this:
I don't defend big blind enough against UTG-CO opens since I don't know what is profitable or not to call with.
I don't defend enough against continuation bets on some boards since I don't know what the best hands to do it with are.
I don't continuation bet nearly enough, I really don't know what the common consensus/theory about what a good cbet % and cbet type of hands in position and out of position are. I just tend to bet draws+value on the usual boards and backdoors+value on dry boards.

I'd appreciate any tips on how to get my redline going either somewhat horizontal or around there.