In my opininon it's a great way of meeting people, getting to know about the city, about places tourists don't know of, cheap restaurants and bars ... also cuz I'm a student and having friends all over the world is only one big plus in your life. It's always an advantage to know a local person somewhere in the world who can tell you where to go and what to try and see there.

Learn: almost anything, any information, any new skills. I pick up things quite fast. Teach: whatever I know and can be taught. Not sure how much of a good teacher I am though. Share: my thoughts, ideas, time, food (if I have some), clothes ...