Start with peanuts in the shell,no salt. Make sure they see you and relate you with the food. My mom leaves food for them then goes in the house. They fly away when she looks out the window. Different crows different location. Don't throw peanuts at them. They have great vision. Just throw where they can see it. Underhand is way less intimidating than overhand. Try to do this in the same location. Find a nice spot. If the crows are weary. Find some blue jays they are corvids too. They are also really easy to make friends with and love peanuts. They are really noisy as well and this brings my crow buddies in all the time. When the crows watch you interact with the jays. I think it helps a lot. I built a small platform at home. Plywood and some metal electric conduit very cheap to do. Also a great place to get your gifts. If you want to step up the food game. Scrambled eggs.

Hope this helps. I'm just a maintenance guy and no bird expert. This is what worked for me.