I want to show bootstrap pop-up modal on first visit of website for unregistered users only. what are the ways through i can achieve the result ?

Hi i am new to nopcommerce.
I want to show bootstrap pop-up modal on first visit of website for unregistered users only. what are the ways through i can achieve the result ?
First visit means : on very first time you visit to home page. After you redirect to another page and again if you come to home page that time the pop-up should not be displayed.

Thanks in advance.