The Summoner's Guidebook: Working with your LoL lane partner

The duo lane is the most strategically interesting lane in League of Legends, but that also makes it complex to play. In a solo lane, you have to think about only your abilities and your opponent's. In a duo lane, the interplay between ADC/marksman and support makes every situation different.

I've talked about playing ADC and support already. Both roles are vital, but whether you're the guy with the gun or you're putting the enemy on lockdown, working with your teammate is the most important thing you can do to win the game.