https://phlearn.com/tutorial/create-shadows-photoshop/

Learn to create realistic shadows for compositing, product mock-ups, product placements, e-commerce and graphic layouts.

Follow along with the included sample images, dive deep into the included PSDs, and create better shadows with the included Photoshop Noise Action.

     8 Sample Images     6 Sample PSDs     Add Realistic Noise – Photoshop Action