Run in the right direction.
The typical direction for most tracks is counterclockwise, but it can vary. Look for posted signs indicating which direction to run (some alternate directions daily) or follow the lead of others runners and walkers, if you’re not sure.
Run in the correct lane.
If you're there to do an easy run, stick to the two outermost lanes on the track. The inner lanes are usually reserved for fast runners or those doing speed workouts.
Pass on the right.
Track etiquette calls for runners to pass others on the right for a counterclockwise direction, on left if you’re running clockwise.
Listen to music with caution.
I've never heard about a track that bans people from wearing headphones, but like when you're running on the road or trails, you should make sure you don't completely cut off your sense of hearing. Listen to your running music at a very low volume or with one earbud out so you're aware of your surroundings and can hear other runners behind you.
Respect the hours of use.
Most tracks have times when the track is off limits to recreational runners, like during a track meet. Some schools allow recreational runners to run in the outer lanes while teams are doing their workouts, but you should ask if you're not sure whether it's allowed.