How to add cookies to a specific page?

Question

PHP

I looked at many sites for adding cookies, but I don’t quite understand how to make my own condition in WordPress.
And the condition is as follows:
If a person visits the site for the first time: he looks at the very first page (let's call it welcome) and an html form is shown below that the site uses cookies.
Otherwise, it is redirected to another page and does not show the html form in the future.
How can I do that?