Poor interfacing, terrible lesson plans, quizzes you on things it never gives examples of, and does an abysmal job at explaining concepts. Switching to ANYTHING ELSE because these people are horrible teachers. I would have better results just googling random stuff than using this 2/10 app Edit: it appears the creators believe that it is me who is at fault for their poor teaching methods. This is far from the truth. I switched to codeacademy and learned more in 1 day than 3 weeks of sololearn