Che cosa significa "Will"? es del verbo "ir" o "hacer"? no entiendo ?

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It's an auxiliary verb, no direct equivalent in Spanish.

I read = leo
I *will* read = leeré
I am going to read = voy a leer

It works exactly the same in Spanish as in English, use it when you have a general intention, use "I am going" when you have a firm plan, use "I read" when it's absolutely happening. (Less common in English than in Spanish but still OK).

I will go = iré
I will do it = lo haré

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You can use "will" by itself when from context the related verb is known.

"Have a good time in Spain!"
"Thanks! I will!!" (= I will have a good time in Spain)

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There is a colloquial expression that means more-or-less "es decir" or perhaps "por ejemplo", always comes at the end of the phrase, and it's a fixed expression.

"Spain is a country in Europe, the Mexico of Europe, if you will."
"Donald Trump is a bad President, the Hitler of our time, if you will."

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"Will" is actually also a real verb but very rarely used as such and sounds quite old-fashioned. More-or-less means "querer" or "desear".

You must do it! I will it!
If you will it, it will happen.