Storing Website-wide variables

Used to developing but nothing web based, and all the questions I find require client based data like cookies/session data.

I want to know how and where can I store data for my website that everyone would access? What are all my options and what are the pros/cons of each.

I basically need like 8 URLs on the homepage which will vary based on a simple bool that will be changed on each page behind the URL, how might I manage that? The change on the 2nd page will influence the first page for everyone hence needing to avoid client data