Scroll Back: The Theory and Practice of Cameras in Side-Scrollers

https://www.gamedeveloper.com/design/scroll-back-the-theory-and-practice-of-cameras-in-side-scrollers

camera visuals reference

A thorough reference of several different styles of cameras in 2D games, and how they work. Covers scrolling, attention, smoothing, snapping, framing, multi-focus, camera shake, and more.