Animate Camera with Splines + How to move a whole camera animation?

Hi,
I want to animate a camera with splines. But at the moment I have no idea how to realize this. Is there a good tutorial available which explains every step to do this? Unfortunately I have not found a good tutorial yet.

My second issue is about moving camera paths. I animated a camera. But my scene has changed and I have to move the whole camera animation to a new position. How can I archive this? Is this possible?

Best regards, Andreas