I think that it will help with my grip if I assign the Fn button to AF-ON and use my third finger to activate it, I can give it a go, anyway.
Yes, good idea to try the various options until you find one that's the most comfortable for you.
Anyhoo, if I’m using AF-C shutter-activated, the camera will track and focus moving objects with the shutter button depressed until I fully press the button down?
Yes, but if you accidentally release the shutter button, which is easy to do, the camera will stop tracking. Then when you press the shutter button again the camera will refocus. This can be time-consuming and distracting. That's why I use BBF, which detaches the focusing process from the shutter button.
Keep in mind that you can use BBF for still subjects as well. Simply press and release the BBF button when focus is made; the focus is then locked. If you need to refocus, repeat as necessary.
I also set the Custom Settings Autofocus > AF-C Priority Selection to Release. That will snap the picture regardless of whether the camera thinks the subject is in focus. I also set the Release Mode dial to Continuous High Speed so I can take a burst of images if warranted.
These are the settings that work for ME. You'll need to research and experiment with these and others in order to get the camera configured to your needs.
I’ve had a go of 3D Tracking on my D5600 and had some decent results.
I've never tried it. Once I became comfortable with AF-C and BBF I didn't want to change. I use Single Point and Dynamic Area and vary the number of focus points depending on the subject.
Yesterday I had it set to Manual and set aperture fully open and 1000th shutter and Auto ISO. I think I’m gradually getting to grips with the camera basics. The myriad of videos on YouTube are a great help.
I switch between aperture and shutter priority depending on the subject. I've only tried the manual setting briefly but it seemed to work pretty well. But I do use Auto ISO which I find to be a very nice feature.
Thank God I’m not shooting film! 3
Those were the days!