Before layers, masks, or anything advanced, there are three moves you'll use in almost every single project: cropping, resizing, and rotating. They sound simple, but each one has a wrong way to do it that quietly ruins image quality if you're not paying attention. Cropping: Cutting Down to What Matters Cropping means trimming away the parts of an image you don't need. In Photoshop, the Crop tool (C) is the most direct way to do it — click and drag to draw a box around the area you want to keep, adjust the edges if needed, then hit Enter to commit. A habit worth building: set an aspect ratio before you drag, if you know where the image is going. The Crop tool's options bar lets you lock in a ratio like 4:3 or 16:9 — deciding this upfront saves you from cropping something perfectly, only to realize it doesn't fit the space you actually needed it for (a banner, a thumbnail, a print size). One thing to avoid: cropping directly on your only copy of the file. Dupl...