We are now officially finished with C, but not with CS50! As we move into learning more about the internet and programming for the web, you should be either working on the less comfortable track (codeacademy.com), or the more comfortable track (CS50 videos).
The first program you will submit for either of these tracks is Problem 4.0: Create Your Own Web Page. This should be done in cloud9 in your ide50 workspace. Please submit your html file, and any other files referenced by your html (css, jpg, png, etc.) into a new unit 4 folder in dropbox.
Whether you are using the less or more comfortable tracks, you are welcome to use code academy and watch the CS50 videos. The biggest difference is that the more comfortable track will move on to learn PHP in order to implement CS50 Finance.