For many years I have been photographing birds in my backyard. I even wrote a book on it, Secrets of Backyard Bird Photography! All it takes is a bird feeder, good background and a perch for the birds to land on. Then a good place to hide from the birds. I keep a variety of photoblinds/ hides to shoot from. Here is a Black-headed Grosbeak photographed with a Canon R6 MKII camera using a Canon EF 100-400mm lens. My camera settings used were AV mode, ISO 3200, f 8.0 at 1/160th of a sec.
