Youtube Videos:
Basic introduction to photoshop layers:
Photoshop Blending Modes Explained:
Lightroom CC For Beginners:
Content-Aware Fill in Photoshop:
Dodge & Burn Effectively in Photoshop:
Another Dodge and Burn Technique:
Multiple Exposure Blending using lightroom and photoshop:
Photoshop Frequency Separation Retouching: