trying to learn how to...

Im deployed in iraq with a lot of time on my hands. I always wanted to learn how to hack and now I have the time to learn. But i want to start off small. This guy sent me a link in a im and when i clicked on it he got all my passwords and locked me out of my yahoo and i had to make a new one and at first i was pissed off. But now i cant stop trying to figure out how he did it. Thats how i found this site trying to learn how to crack myspace passwords. But everything i was reading sounded like jiburous. Can you guys teach me where to start how to make a cookies stealer and how all the basics?

I'll lock this since it's a dupe of the one posted in the tutorials section.