What's the difference between "He is no fool" and "He is not a fool"? [duplicate]

For a non-native speaker, the above two sentences seem similar.

From the point of the native speaker's view, is there any slight difference?

In the same vein, "I have no money" and "I don't have any money" seems similar to me. Am I right?

Solution 1:

He is no fool

This is emphatic negation. The implication is the guy is by no means foolish. On the contrary, he's probably quite shrewd and will see right through you.

no: Not at all; not close to being: He is no child.

(AHD)

You use no to emphasize that someone or something is not the type of thing mentioned.

He is no singer... Kathryn was no beauty at the best of times.

(Collins Dictionary)

He's not a fool

This is a more neutral statement that simply says the person is not foolish.