HTML is the core language for building web pages. It uses tags to structure content like text, images, and links. It's not a programming language but defines a page's layout and works with CSS for style and JavaScript for interactivity.
Docker is a platform in which multiple services can be run in containers, it is a very versatile tool that can do almost any network related activity. It can do anything from DNS filtering with Adguard Home to hosting a proxy server with Nginx