There’s a general progression when learning Photoshop. You muddle about in it yourself for a while, figuring things out as you go, then pick up a couple of tricks in Facebook groups, and start using them on all your images. Then you discover a better way of doing things and wonder what the hell you were thinking at most of your old work.
Photoshop offers us a great many powerful and useful tools for improving our images. But, it also lets us screw them up through bad technique, too. In this video from Nathanial Dodson at Tutvid, we learn 10 things to not do in Photoshop. Some of these things are phases people go through, others are techniques actively promoted through various Photoshop groups on social media.