The 8 most important Tools to to master Photoshop. 1. Brush Tool. 2. Adjustment Layers. 3. Clone Stamp. 4. Layers. 5. Blend Modes. 6. Transformation Tools. 7. Liquify. Retouchers often rely upon the Liquify Tool to assist them in moving pixels on screen. 8. Crop Tool. It is the Crop Tool is likely to be one of Photoshop's best-loved tools. .