CSS: A presentational language used to style the appearance of your web content (fonts, colors, layout, etc).Learn more about HTML with the Basic HTML and HTML5 course on freeCodeCamp.You use HTML to add structure to your web content, defining things like headings, paragraphs, and more. HTML: A markup language that every web browser is able to understand.You'll pick up a lot through the course of the Tutorial. Don't worry, you don't need to be an expert with these! A high-level understanding of the basics should be enough.