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The negative structure is:
If + do/does not + present simple, will + verb (in infinitive).

The interrogative structure is: Interrogative + will + verb (in infinitive) + if + present simple?

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We use modals to show if we believe something is certain, possible or impossible. For example: can, may, must
shall, will, could, might, should, would.

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If you study, you will get a good grade.
Simple Future - Will

When I see her, I'm going to tell her the truth.
Certainly Future - Going To

When you see her, you may tell her the truth.
If you read the book we can talk about it.
MODAL VERBS

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When = When I die, I’ll leave all my money to charity.
As soon as = This situation is very urgent. I’ll call you as soon as I have more information.
As long as = She will invite you to dinner as long as you're free
In case = She will invite you to dinner in case you are free
If not = Unless = You’ll fail the test unless you study.

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2) If it rains tomorrow, I'll take the car
If + simple present; simple future.

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1) If you freeze water, it becomes solid.
If + simple present; simple present.

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Zero Conditional (Review) and First Conditional - What's the difference

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Zero Conditional (Review) and First Conditional - What's the difference

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Conditional tenses are used to speculate about what could happen, what might have happened, and what we wish would happen, certainly or uncertainly. In English, most sentences using the conditional contain the word if.

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If I study today, I'll go to the party tonight.
If I have enough money, I'll buy some new shoes.
She'll miss the bus if she doesn't leave soon.
If I call Daniel, he will be really happy.
If they don’t hurry, they will miss the bus.

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The Present Simple is used to represent a possible future condition and the Simple Future to show a possible future result, action and reaction.

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It's , in all the above situations there is reference to a future condition. None of the situations is happening yet, but there is the possibility of all of them to conclude, possibility.

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In the First Conditional there is a real possibility that the condition, action or situation in matter will happen, causing a possible and predictable reaction.

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Will: will not - won't
Might: might not - mightn't
Can: can not - can't

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Follow the same structure.
Will: used when the speaker thinks the situation is probably to happen.
- If I go to Paris, I will buy a French guidebook.
- If we tell our parents we want it, they will give it to us.

Might: used when the speaker is unsure of the situation, uncertainly.
- If I go to Paris, I might buy a French guidebook.
- If it rains tomorrow, I might stay home.
May
Can: used when the speaker is not sure if the situation will happen or not.
- If I go to Paris, I can buy a French guidebook.

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The First Conditional is used to express actions, circumstances, or situations that are likely to happen in the future, when we talk about future situations we believe are real or possible, possible things.

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The affirmative structure is:
If + Simple Present + Simple Future + Complement
(If + present simple, will + verb (in the infinitive)) - It's possible to change the order, putting the result first, changing the punctuation, but not the meaning.
If you give her some love, she will love you back.
The condition: If clause (If) + subject (you) + verb in simple present (give) and complement (her love) + comma (,)

The result: Subject (she) + simple future (will) + complement (love you back)

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So, there is the use of the first conditional when we talk about future situations,  that will be generated as a result.

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When the condition comes before the result (starts with IF), there is the use of a comma (,).
If we tell our parents we want it, they will give it to us.
(if + condition + result)
If you pay attention, you will learn this grammatical point.
(if + condition + comma + result)

When the result comes before the condition, the comma is not present (used or necessary).
I'll call you if I'm late.
(result + if + condition).
You'll learn this grammatical point if you pay attention.
(result + if + condition).