Pretty basic question, but I was curious how you use the Custom modes on your dial. Some cameras have only one “C” on the dial, while others have 3, maybe 5 of them. For the longest time, I ignored this feature, but I’m venturing beyond now that I’m more comfortable with the rest of the camera settings.
I’ve been trying to set one up for BIF, where shutter speed and ISO are higher, and tracking is enabled. My success isn’t all that, but maybe things will improve.
There are lots of instruction videos at "youtube" for bird photographers that relate to your individual camera. While I prefer written instructions, watching some of the videos have help me with my camera settings for bird photography.
My cameras have three places where I can save groups of settings, and I wish that Canon would provide more than three places where I can save more. As it is now I have one for animals, one for people, and the third one for taking photos of the Auroras. The one for animals include eye focus, servo, tracking, and burst mode. The same for the one I use for people, except that it has single shot/burst with a back button. Both include spot focus, and Auto ISO. I can control the spot focus with the joystick if needed, and tracking by pressing the star (*) button.
The one used for the Auroras uses a few manual settings (manual focus, no spot focus, and fixed 1250 to 1600 ISO speed depending on how bright they are).
For taking photos of wildlife (birds, moose and so on) I don't have enough time to set the camera the way I need to. All I do is to switch the camera on, and turn the dial to A for animals, or B for people, and to C for Northern Lights.
For macro, landscape, and so on, there is plenty of time to set the camera as needed. One thing I like about some new cameras is that one can set it so it can be controlled using the touch screen. For example pressing the shutter release while looking through the viewfinder, or "touching" the screen to release the shutter if not using the viewfinder.