You will learn about HTML, CSS and JavaScript as very basic level with their meaning. Last video shows how to make your single page website live on server for everyone around the world to view it.
It is very hard to cover all the tags and markups in single course. I have shown 2 , 3 tags usage. You can visit url shown in last video to of w3school to learn about many other useful tags of HTML, CSS properties and JavaScript. This course is kind of overview of what you can expect in these technologies and how to use them.
It will lay foundation to your knowledge of HTML, CSS and JavaScript.