While we’re on the subject of the Curves adjustment brick, I thought I throw one more tip up.

Click on a curve point then hit your arrow keys to adjust.

Start by clicking anywhere on the curve to create a curve point. Most people adjust this point by dragging it with the mouse, but you can actually adjust it in very fine increments by using the arrow keys, and this will let you move the point in any of the four directions of the arrow keys.