what is the difference between مِنْ and مَنْ ?

Answer 1

In Arabic من have many meanings it depends on the phrase :

it could means ( who , from , condition )

who : من هو سعد؟

from: من أين أنت؟

condition : من يدرس ينجح

Answer 2

Without the diacritics, the two words are confusing; however, the context shows which is which.

1.        مَنْ is a wh-word meaning ‘who’ as in

مَنْ حَضَرَ الدَّرْسَ؟

Who attended the class?

-     Also, the word could mean ‘whoever’ as in

مَنْ كَانَ مَرِيضًا فَلِيَذْهَبْ إِلَى البَيْتِ.

Whoever is ill, (let him/her) go home.

As noticed, مَنْ  must be followed by a verb.

2.        مِنْ  is a preposition that has to be followed by a noun/pronoun as in

هِيَ مِنْ مِصْرَ.

She is from Egypt.

هَلْ هِيَ مِنْ مِصْرَ؟ نَعَمْ، هِيَ مِنْهَا.

Is she from Egypt? Yes, she is from it.

This is a simplified answer, of course. There are loads of shades of meaning in different sentences, but these here are the most frequent and of importance to beginners and intermediate levels.