The first conditional is used to talk about real and possible situations in the future.

Here’s the correct structure:

If + present simple, + will + base verb
Example: If I see her, I will tell her.

Notice that „will“ is not used in the „if“ clause, but in the 2nd part of the sentence.

This is incorrect:
If I will see her, I will tell her.

Tip:
In the first conditional, always use the present simple after „if,“ and save „will“ for the main part of the sentence.