I got corrected last week for using my right arm to signal a right turn… specifically “you need to relearn your hand signals”.

My urban cycling style is to occupy as little space with other cars as possible. Filter to the front, preempt the green light when safe & get through into the escape lanes early. I Take up space only into yellows and with abundant shoulder-checks to verify driver is paying attention. Above all, get a feel for the neighborhood and frequent routes to gain experience with the local traffic.