I use these a lot, because it saves a trip over to the Layers panel dozens of times a day. To move your current layer up one layer (in the stack of layers), press Command-] (Right Bracket key; PC: Ctrl-]) and of course to move down, you’d use the same shortcut with the Left Bracket key ([). To move the current layer all the way to the top, add the Shift key. Of course, you can’t move anything below the locked Background layer.
Excerpted from The Adobe Photoshop CC Book for Digital Photographers (2017 Release) by Scott Kelby.