I have a problem. I wanted to cast shadow on a cube. So I created a new file and added plane like this. Why doesn't the point cast shadow on cube?!
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You are currently in solid mode and not in the render preview. The former uses a simple shader and no path tracing is applied.
If you press F12 or use Render > Render Image you will see that the lamp casts a shadow in the final render as well.
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$\begingroup$ If my answer solved your problem, please mark it as accepted by clicking on the checkmark next to it. $\endgroup$ – Robert Gützkow♦ Oct 30 '19 at 6:17