There is a lot of nutrition information out there. A lot of incorrect and extremely controversial information, which can be confusing and frustrating if you do not know how to pick out credited sources.
Precision Nutrition has dedicated years to research and coaching and does a great job of giving you the facts about foods, vitamins/mineral and then providing some recommendation.
Check out this article on Dairy. It is long but you can skip the science parts of it if you just want to find out how it will affect your fitness, weight loss, or how to make the decision if dairy is right for you.