The document discusses various photo editing techniques in Photoshop including adjusting brightness, contrast, saturation, dodging, and burning. Brightness adjustment makes the whole photo lighter or darker. Contrast adjustment makes details stand out more by making tones darker or lighter. Saturation adjustment intensifies or dulls the colors in a photo. Dodging and burning tools are used to selectively lighten or darken areas of an image. Filters can transform the appearance of a photo with effects like tiles or paint brush styles.