Stop the Jitter
In a recent YouTube tutorial I showed you how to make a smooth camera follow here: https://www.youtube.com/watch?v=aHB8u5AS5Jw.  Now this works okay, but you might get camera jitter when you move the character around.

This happens when the update on the camera and the update on the character movement are out of phase.  Sounds like something out of Star Trek, but it's easy to fix.

Make the update for the camera happen in a FixedUpdate() method and move the movement update controls for the character into a FixedUpdate() and just like magic the jitter will disappear!!