Expression 'make no mistake'

[Tamara]

Hi

make no mistake

For example, Make no mistake about their intentions.
or
Make no mistake, these messages aren't sent by students bored with studies and looking to make a name for themselves.

Could you give some comments about the (use of the) expression, in comparison with don’t make a mistake?
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It’s impossible to learn swimming without entering the water…

[Conchita]

Make no mistake is a phrase used to mean 'there's no doubt about it', 'I'm absolutely certain about it'.

Don't make a mistake is used literally: don't make an error/don't do a wrong action.

[Tamara]