How can you learn how to properly create shadows?

Question

Books

Is there any literature on this subject or anything else?
What can you advise in general?
Here is an example:

Answer 1

I advise you to study the world around you. How everything looks in reality, how the shadow falls, how long it is under certain conditions, and try to do the same based on this information. Turn on physics and geometry, try to do everything first under the ruler with calculations.
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Shadows were not invented by writers, learn from the real world, because you draw from it...

Answer 2

wangyu nuclear explosion on the left behind the scenes

Answer 3

An example is extremely unsuccessful from the point of view of physics

Answer 4

To learn how to draw, you need to draw, not special. read literature. And there are a lot of materials on building a shadow, you just have to google it.

Answer 5

And what's with the design? do you need shadows in the interface or shadows in graphics (read arte)? The approaches are different for these two methods. for the first there are guidelines, for the second there are lessons on light-shadow and perspective.