Don't turn around to talk to friends. Do not ride in the middle of the road and do not right in the middle of the right lane. Stay right by the curb. If you have to ride at night, make sure you have lights on the front and rear of your bike. Reflectors are not always enough.
Bicycles are vehicles and are supposed to be ridden on the road.
Sidewalks are for pedestrians and not for bicycles. Use hand signals. Use hand signals when you stop or make a turn. This lets drivers and other bicycle riders know what you are going to do. Bike Safety DO's and DON'Ts.