Questions about camera Fine Use for Animation Rendering

-I also find that the keyboard keys to move the camera, when viewing through it, in flying mode, are not enough, since there are no keys to turn or twist on the spot, only the mouse. Is there a non-mouse way to do camera turning (pivoting) and twisting from keys?

-What is the equivalent of a Shape Key for the camera, for the timeline and dope sheet? What options do they allow? How can I set up start and end location states for the camera?

How can I set up start and end location states for the camera?
Just as animating any other object
start frame - set location and rotation, set keyframe (I)
end frame - set location and rotation, set keyframe (I)
In graph editor you can change interpolation mode

That’s exactly what I needed confirming. Thank you!