I tend to agree that reading up on wildlife photography tips, learning one's camera well, lots and lots of practice and shooting, and going to hotspots if there are any in your area to get help or tips from fellow photographers...all are probably the best methods. Certainly the cheapest compared to a course. There are all types of bird photographers out there, and you have to judge them by their receptiveness to talk - some will not even want to say hello when they're out shooting and others will be downright friendly...when you find one that's friendly and start chatting, you can get some good beginner tips, camera settings, etc. I did just that almost 2 decades ago when I first started wildlife photography...and as I got more experienced and better, I've happily shared tips with various beginners and mildly experienced photogs looking for tips or asking about settings. Just don't bother the photographers who don't say hi back to you - they're in their world and aren't receptive to chatting. Birding hotspots are generally best because there are so many photographers around that you're bound to find some who like to chat. I'm lucky to be in South Florida, which is not only a fantastic birding hot spot, but there are dozens of spots to shoot where everyone's mixed in on open trails or boardwalks, no hides are needed, and you can talk at conversational levels without disturbing the wildlife at all...I still occasionally run into photographers who don't respond at all to a nod or hello - I don't take offense as everyone is in their own mindset when out shooting. But I've also met a lot of friends out shooting and helped out many beginners trying to figure out how to get better results.