How to properly implement a password change system?

Question

Web development

Hello colleagues!
How to properly organize the work of such an algorithm:

1. User forgot password
   
2. The user clicks on the "recover password" button
   
3. The user is sent an email with a link to the recovery page, which will no longer be relevant after 15 minutes.
   

I do not quite understand how to generate this very temporary page and how to get rid of it when it is no longer relevant.
I would like to thank everyone in advance who will help.

Answer 1

It is not necessary to generate the entire page, but just some kind of recovery key and send this key to the recovery page with a GETrequest. And in the letter just generate a link to the recovery page with this key.
Get something like this.
https://mysite.com/account/recovery?key=ABCD