little fill-in ....what does it mean here?
though displaying the attitude "You are important" gets results,
and even though it costs nothing, few persons use it. A little fill-in
is needed here to show why.

Question

little fill-in ....what does it mean here?
though displaying the attitude "You are important" gets results, 
and even though it costs nothing, few persons use it. A little fill-in 
is needed here to show why.

Answer

The context here is important. I believe this is from an informally-written article giving career advice. I interpret it to mean "demonstration of this fact is required"

Answer

Without more context, I would say this means "explanation".  The writer is saying he/she needs to fill in the gaps in the explanation.

Answer

A story behind the story, a brief explanation/example.To fill in means to "tell".

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