Gotta be careful, Eye for Video. Absolute positioning is a fantastic CSS technique, you just have to be careful about when/how you use it. It's rarely ever a good idea to use position: absolute to position elements relative to the body (I know that sounds contradictory, but it's not).
To the OP, take you time and read up to learn what the different methods of positioning actually are and what they each do. They all have their uses, but, especially newcomers to CSS, you have to be careful that you don't use them unnecessarily.
W3Schools tutorials are a great way to learn about them.