Read the full text with total focus (first time,even if you don’t understand), okay? Now, read it again. I am pretty sure a lot of things will make sense this time around. After the second time, google the concept and try to read about it in different articles. That will help you see it from different angles, which will help you better understand it.
Please don’t quit — every expert was once a beginner

It will be useful to do further research on Diffuse mode.

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