I'm following Blender Guru's tutorials, and I'm doing the last part that consists of lightning the chair. When I try to put the spotlight, I can't really see the difference because it seems to have a global light that I don't know how to shut down. In the final render, you can see that only the screws have a shadow, the chair remains with constant light in it. Could someone help me? Thanks! ^^ 
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$\begingroup$ in what shader mode are you? Material or Rendered? $\endgroup$– moonbootsCommented Dec 31, 2020 at 15:19
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$\begingroup$ Any chance you forgot a Shader node and plugged your Image Texture directly into the Material Output? $\endgroup$– Christopher BennettCommented Dec 31, 2020 at 15:29
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$\begingroup$ @moonboots In rendered. $\endgroup$– LetíciaCommented Dec 31, 2020 at 15:30
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$\begingroup$ @Christopher Bennett It is not. It is plugged in base color, in 'Principled BSDF' $\endgroup$– LetíciaCommented Dec 31, 2020 at 15:33
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$\begingroup$ Strange, it appears to be "un-shaded". And you say this is happening in the render as well as the viewport? $\endgroup$– Christopher BennettCommented Dec 31, 2020 at 15:35
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1 Answer
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That happens when you are not using a shader and plug a texture directly to the surface of the material.
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Plugging a texture directly to the material output, the texture becomes emission source.
Shaders define what happens to light rays on the surface of an object. Without a shader... well... there is no shading..
Use a shader and plug the texture as color.
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$\begingroup$ Thank you @susu for your explanation! Super well detailed, it will certainly help others! :) $\endgroup$– LetíciaCommented Feb 4, 2021 at 21:17