>>3993427not the other guy, I shoot with an a6300 and while the only other cameras I've used is a canon film SLR and a few random nikon DSLRs I like the camera, there's nothing really wrong with it apart from the screeching you find here, it's a camera, period. The menu is not the best but absolutely no deal breaker either especially if you get the thing for free. You set your settings once and it's done apart from minor things, you don't live int he settings menu.
The glass you need for bird photography is kinda nuts though, long lenses with decent quality ain't cheap, cheap long lenses will have mediocre quality and be dark because no wide aperture (not limited to cropth though). From my limited experience, if you must get anything for the camera that you're stuck with, get an old manual long prime lens, way better image quality than a zoom, possibly decent-ish aperture (even though you're still on crop so tough shit) and not outrageously expensive. And primes make for a rather fun experience, especially since, unless you buy absolute bottom of the barrel garbage, vintage primes tend to be of good mechanical quality and depending on model/luck it'll simply feel amazing to use.