I think many basics are clear, and controversy-free.
Clearly, strength training as said- I think what I needed to learn, and what was my misconception about it, is that I don't need to be a monster body-builder to successfully strength train.
Also, a seemingly popular misconception is that exercise is more important than diet. It was for me, anyways. I think I get it now- I'm no angel, and had a few too many holiday cookies, but have improved that alot.
The other issue to me is, to paraphrase another place I frequent, "Nerd Fitness"; do what you like. You'll be more apt to stick with it, and can build from your success.