How to Win at Connect 4

A five-minute primer on basic strategies for Connect 4. When I was in junior high school, a friend and I would play this on the bus to and from school every day (we drew the board as a grid in a notebook and then filled it in with X's and O's, tic-tac-toe-style), and I really could've used this at the time!

(Also, I've been playing chess reasonably seriously for close to a decade now, and it was interesting to me how many of the general concepts here are similar—control the center, anticipate your opponent's ideas and responses to your moves, and keep forcing them to respond to your threats.)