In this section, you are going to learn HTML. HTML is the backbone of the web. It is the studs inside of a house or the bones in our bodies. It is the foundation upon which all web pages are built. So, having a solid grasp of it is crucial.

Learn to Code HTML & CSS by Shay Howe

Start with the left column first and then move on to the right column advanced section. In the left sidebar there is also a Course 201 'Learn to Code Advanced HTML & CSS' you should take this course as well.