Break it: Despite the powerful temptation to improve an image with Adobe Photoshop or other image editor, you’re still much better off getting as much of it right in the camera as possible. Crop later? Better to crop it now, in the camera, and not throw away those pixels unnecessarily.
While you should leave ome decisions (e.g., setting white balance) to the processing stage, many fixes, such as brightening a significantly underexposed image, can reduce picture quality. As much as editing is a part of the craft of photography, skill with the camera remains your most important tool.