Macbook Pro Retina 13" Battery Life - Need Advice

Hi. I bought my first ever Macbook Pro Retina 13" a few days ago. I am mainly going to be using it for college work, listening to music and watching youtube videos in my spare time. And browsing the net of course.
I was wondering what is the BEST way to charge my laptop in order for me being able to use it for a long time when its not plugged in? Do I let the battery go all the way to 1%? I did that the first two times and I am worried because I've heard its bad. Or do I let the battery drop to about 20% EVERY TIME and then charge it? Or do I charge it whenever I need to and only let the battery drop to about 20% a few times a month? I am really confused. Ive been on many different forums etc and everyone is saying something different. As I said, this is my first macbook and I don't want to ruin the battery life.
Any help would be greatly appreciated.
(Sorry if I've put this post in the wrong community.)
If you need any more info about the Macbook, ask away.

Apple - Batteries
Apple - Batteries - Notebooks

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