There’s not too much you need to do on a daily basis to make sure your bike stays in tip-top shape, but you should always make sure there is air in your tires. If you notice you’re filling up your tires often, inspect them for punctures. Every other week, check to make sure everything on your bike that should be tightened, is tightened. This includes (but isn’t limited to) bolts on your tires, seat post, and handlebars. If you feel like something isn’t quite right, whether it’s the direction of your wheels or the tautness of your chain, check it out. Always consult with your local bike shop to ensure the your safety and of those around you. 

As you ride you should always be aware of the terrain you’re riding on. Avoid obvious hazards like nails and other sharp items that could be on the road.