I think that what makes this course a great introductory one is the instructor, Colleen van Lent. She has a positive and engaging manner in the way she presents the material. But that's not all: when needed, she explains key aspects in detail, warns you what you should be really careful of. Additionally, in the course you can find a lot of useful and interesting links. One final thing that I would like to point is that,in this lesson,not only do you learn the basics of HTML, but also you get a grasp of other aspects like accessibility.