Keep reading Grantland. They have great weekly columns, particularly for the NFL and NBA, that have broadened my understanding for and appreciation of the sport

Keep reading Grantland. They have great weekly columns, particularly for the NFL and NBA, that have broadened my understanding for and appreciation of the sports I thought I knew. Honestly, they're the best. You could also try fantasy sports, but they don't teach you much about the game - they just encourage the sort of singleminded obsession that makes learning any subject easier.