Riding a bike in traffic isn't rocket science. Probably the #1 key skill is bike control and the ability to ride in a straight line, and put the bike where you want it to go.

The rest is about understanding what's happening around you, especially at intersections, and when riding along parked cars. Folks have been doing his for decades and the risks are very exaggerated. There's a lot of small knowledge that separates experienced riders from noobs, but as I said i isn't rocket science, so you can learn as you go.