Quick Selection Tool: This selection method works very similar to a brush, allowing you to brush over the areas you wish to turn into a selection. By default, every stroke adds to your selection. If you wish to deselect some areas, hold down your Alt (Windows) or Option (Mac) key and brush.
Layer Masks: If there’s an area of your layer that you wish to hide (or bring back), Layer Masks will help you do that. Painting using a black brush will hide portions of the layer, and painting with a white brush will reveal them. Black and white gradients can also be used.
Adjustment Layers: By using an Adjustment Layers, you’re able to change targeted areas of your photo without damaging the original layer. These can either be applied to the full image, or specific areas using selections or Layer Masks. At any point in the future, you can either make changes to the adjustment, hide it, or delete it completely.
Clone Stamp: This tool lets you set the source of the heal, telling Photoshop exactly what to replace the affected area with. In the Clone Source window, (Window menu to Clone Source), you can also flip or rotate the source for advanced healing.