It's really a requirement ot go out and observe birds!
Out here in the desert the ravens in particular enjoy flying. They will "slope soar" off anything that creates lift, and while they're beating back and forth in the lift anywhere from 2 feet off the ground using a drainage ditch to 100 feet up along the face of a building, the primary -steering- control is the tail! It twitches up and down independently on each side to maintain the heading the bird wants.
The wingtip feathers are not used for steering.
Pitch control is more difficult to detect..
Go out and observe!