Storing Session information and linking to new page on click

I hope this isn't stupidly simple. I am completely new to web dev.

I have list items that I styled as buttons. I want to be able to link to a new page as well as store some information when the list items are clicked. I want to be able to store which list item was clicked in a Session variable. How do I accomplish this/ is there a better way to accomplish the same thing?