1. Start by riding on quiet side roads.
2. Hi-vis jerseys, jackets, etc.
3. Reflective stuff.
4. Lights, especially at night.
5. Mirror to see behind.
6. No earbuds, headphones, etc. ... listen to your surroundings.
7. Pay attention to your surroundings in general.
8. Ride confidently, in a straight line (predictable path), signal your intentions ... and don't be afraid to take evasive action if necessary. (I've ridden onto dirt shoulders or up onto footpaths on occasions)
9. Know that you are invisible. Most drivers won't see you ... chances are other cyclists and pedestrians won't see you either. Despite the hi-vis stuff, reflective gear, lights, etc. when you start pedalling somehow you activate a cloaking device. So don't make any presumptions that the driver must see you in all your bright kit ... assume they don't see you, even when you're right in front of them.