What's the best website for learning HTML

These days, learning HTML by itself isn't a valuable skill. HTML is really just the basic framework for a website that other tools build off of to create something modern. Think of HTML as being like the steel girders that support the structure of a skyscraper internally. It needs a lot more than that. Websites built purely with HTML will look very dated. You'll need to combine it with CSS (Cascading Style Sheets) for design, Javascript (for websites that respond to user unput), and PHP/MySQL (for handling databases and other server-side calculations). If you're already familiar with Java, then Javascript and PHP are going to be really comfortable to get the hang of since they use similar programming syntax. HTML itself is going to be a breeze compared with Java. Google will bring up a lot of results for learning HTML/CSS. Here's one that looks promising: https://www.codecademy.com/catalog/language/html-css