This is the app Alan was telling us about for annotating books students are reading for your class. Where they can add questions, respond to your questions and respond to each other.
Take a look at the Make tab and also the Tools under the Explore tab. These activities might be great ways to incorporate coding and web literacy into your lessons.
This is the program my husband used to teach my 8th graders how to code their text for the app. My students loved it and can't wait to code! They code on one side of the screen and see the results on the other side. It gives them instant feedback to see if their code is correct or not.