If you want to duplicate a layer in Photoshop, there are a few different ways to go about it. One way is to use the keyboard shortcut Command+J (PC: Ctrl+J). Another way is to use the Layer menu and select Duplicate Layer. If you want to duplicate a layer without having to go through the menus, you can use the shortcut Command+Shift+D (PC: Ctrl+Shift+D). ..
Fastest way to make duplicate copies in Photoshop
Check out How To Fill Color In Illustrator?