HTML is a widely used language in this day and age. How well you work with it can easily place you head of the pack or severly trailing behind it. This tool written by Dave Kristula addresses all the basics for using HTML and even has a section dedicated to some advanced portions.

Good Features:

• Starts out very basic
• The learning curve is very gradual
• Following lessons build on what was just taught
• Easy organization for specific help
• Gives an example at each 'try it yourself' phase for added help
• Tutorials flow directly into the more advanced lessons when clicking 'next' on the last basic lesson

Bad Features:

• Riddled with ads causing some information to get overlooked

Missing Features:

• Quizzing
• Progress tracking