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I took a 2 hour lesson that a local outfitter was offering but most of the stuff I learned on youtube I think the channel I found easiest to follow was the tightlinesflyshop
Fly fishing is like any other fishing in the sense that it can be as simple or as complicated as you'd like it to be.
Learn how to set up your rod, research what flies and tecnniques (nymphing vs dry flies, steamers etc) and learn the basic overhead cast, the roll cast and line mending for a drag free drift. After you have an idea go out to an open area of grass and practice practice practice your casts.
any questions please ask