There are some great resources that teachers have carefully selected free content from the web. These include interative science and math sites, print worksheets available for free, teacher tube and youtube videos, writing sites, history sites. What's nice is that teachers become sort of experts on what is considered appropriate material for learning adn what is not. This site, for example, lists a bunch of resources that teachers have put together in a sort of library format. http://bit.ly/2F0KWf