Does anyone know some App where I can do intermediate html lessons?

Question

Hi there, I did HTML, CSS and JS and I'm quite excited to go further. I already started to just code stuff in notepad++ or so and then compile it in IE and that's good to practice. But I'd love to learn more, so I hope someone will help me with some nice apps :)
thanks in advance

Answer 1

Team Tree House, W3Schools, Codeschool.org

Answer 2

thanks to both of you, I tried Codecademy before, but do they offer an app? I'll check the other ones out soon

Answer 3

www.codecademy.com