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Garry Edwards
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It depends, does that help? 
Close to/touching light source, e.g. blocking part of a softbox - to reduce its effective size.
Fairly close, to stop unwanted light bouncing around where it isn't wanted
Close to subject, for fine control of light hitting subject and to create a sharp demarcation point.
It's similar to using a gobo, such as a shape cut out of a piece of cinefoil. The closer it is to the subject and the further it is from the light, the sharper the image will be, see (NSFW) here https://www.talkphotography.co.uk/tutorials/nsfw-creating-and-controlling-shadows.165/
Close to/touching light source, e.g. blocking part of a softbox - to reduce its effective size.
Fairly close, to stop unwanted light bouncing around where it isn't wanted
Close to subject, for fine control of light hitting subject and to create a sharp demarcation point.
It's similar to using a gobo, such as a shape cut out of a piece of cinefoil. The closer it is to the subject and the further it is from the light, the sharper the image will be, see (NSFW) here https://www.talkphotography.co.uk/tutorials/nsfw-creating-and-controlling-shadows.165/