How to keep value of variables when user moves pages from one to another

I will write what can be considered to keep value/variable when user moves pages from one to another.

1. Use cookie. Keep the value in cookie in browser and read it later.
   • (js)https://www.w3schools.com/js/js_cookies.asp
   • (js)https://stackoverflow.com/questions/1458724/how-do-i-set-unset-a-cookie-with-jquery
   • (php)https://www.w3schools.com/php/func_http_setcookie.asp
2. Use DOMStorage (sessionStorage/localStorage) and keep the value in browser and read it later.
   • (html5) https://www.w3schools.com/html/html5_webstorage.asp
3. Use session variable and keep the value in server and read it later.
   • (php)http://php.net/manual/en/session.examples.basic.php
4. Use DB/SQL and keep the value in DB of server and use SQL to read it later.
   • Use the web framework's functionality to connect to DB and to write SQL for DB.

Or, not keeping the value, but passing the value via Get/Post method is also good if the value is not complicated data (passing ID integer for example).
I think Get method is usually used for this purpose. Sending by POST is usually used when you want to save the data in DB after receiving.