Day One
Watch
(0) "The Internet: Crash Course Computer Science #29"
(1) "The World Wide Web: Crash Course Computer Science #30"
Read
(0) "How does the Internet work?"
Day Two
(0) "HTML, CSS, JavaScript Explained [in 4 minutes for beginners]"
(1) "HTML in 100 Seconds"
(2) "CSS in 100 Seconds"
(0) "Getting started with HTML"
Do
(0) Browse to the "Active learning: Adding some features to an HTML document" section of the reading material and try the lesson listed there!