https://www.creativelive.com/class/stupid-moves-in-photoshop-ben-willmore

Avoid the everyday actions that make your post-production work difficult. Ben will clue you in on common functions and actions that can unknowingly degrade the quality of your images, bloat file sizes, or cause serious problems with your edits when you attempt to print your images. You'll also learn how to fix or replace these actions with more efficient, effective, and safe methods to make your life easier.