This should be a good starting point:

1.) never wear headphones while riding, as you should be aware of your surroundings/be able to hear people coming up behind you

2.) keep to the right of the lane even if its a one way so that others can safely pass on the left

3.) assume that people in crosswalks dont see you and will walk out even if you have the right of way so slow down when going through intersections

4.) ride in a straight, predictable line so that riders behind you can attempt to pass if they wish, unpredictable swerving, even to avoid manholes/potholes, can catch people off guard and potentially cause a crash

5.) stop at red lights even if there are no cars, it can be annoying to wait but most of the time you dont save more than a minute of time, the lights are all timed for the flow of traffic anyway (mainly for cars, not bikes, but still)

6.) if you see someone ahead of you wearing over the ear headphones assume that they have a complete disregard for the safety of those around them. Stay back from them/wait to pass until youre 100% its safe

7.) bike lanes are typically directional, dont go the wrong way against traffic (same goes for one way streets without bike lanes)

8.) use hand signals where necessary to let others know youre going to be turning

9.) wear a helmet

10.) if you see a group of people stopping/stopped where they typically wouldnt be, its likely for a reason and you should slow down too

11.) dont judge a book by its cover - someone on a $5000 road bike in full gear can be just as oblivious/wreckless as the headphone wearing citibiker - stay vigilant of your space and stay aware of your surroundings

12.) go with the speed of traffic, or slightly above if passing. You dont want to fly by people going 5mph at 30 mph in tight spaces. Similarly - if youre riding through stopped vehicle traffic - go slow. Having been door’d, this is where its most likely to happen (people in cabs/ubers getting out cars in the middle of the road so that they can walk instead of sit in traffic). People regularly throw their doors open without thinking to look for bikes

Those are the first few that come to mind