Watch: Please view the following 4-minute video by Hostinger Academy, a YouTube channel that makes a bunch of great tutorial and technical videos on building and managing websites. In this video, they go over the basics of HTML, how it works, and the structure of HTML code.
Additional Resource: If after watching the video you still feel that you don't quite understand the basics of HTML or for those who learn better through reading, we recommend going through this article, also created by Hostinger Academy, which goes a bit more in-depth into this topic: What Is HTML? Hypertext Markup Language Basics Explained