HTTP Strict Transport Security (HSTS) informs browsers that the site should only be accessed using HTTPS.
jQuery is a JavaScript library which is a free, open-source software designed to simplify HTML DOM tree traversal and manipulation, as well as event handling, CSS animation, and Ajax.
Ko-fi is an online platform that helps content creators get the financial support.
Lightbox is small javascript library used to overlay images on top of the current page.