Slowly change to the other lane. Do not swerve. Blind spot is the area which cannot be seen through the rear view mirrors. You have to look over your shoulders to make sure there are no vehicles in your blind spot. This is particularly important when you are changing lanes.
Traffic going straight has the right of way.
That means if you want to join a main street from a bylane, stop near the junction and wait till the way is clear or some driver stops and signals you to join in. In this case you should wave at the other driver as a gesture of thanks. Drive within the posted speed limits, but do not drive too slow or you will get honked. Do not get upset or angry if someone honks at you. This happens with everyone in the beginning.