This document has several good hints but it necessarily only exposes the tip of the iceberg. You can rotate, crop, resize, distort, recolor, and otherwise edit your image. If you can imagine it, you can probably do it in Photoshop . Photoshop's general tendency is to provide very general and simple tools that can be combined in various ways to get complex and sophisticated results. This makes the program more difficult to learn but ultimately gives the accomplished user much more creative power.
Many commands work with modifier keys to alter the performance of various tools.
There are several tool palettes which add information or control. As your familiarity with Photoshop grows you will gain speed and facility. More detail can be found in the Adobe Photoshop User Guide , which is in the scanner office. Do all of your editing in RGB color, which is the default mode after a full color scan. Full 32-bit color RGB mode allows Photoshop to do the best job during editing.