The simple step by step instructions in a game-like environment

Their inbuilt online compilers and IDE's environment look great!

I had a difficult time in learning basic programming courses but Codeacademy gives short, digestible lessons with hands-on activities you can complete right in the browser. This hands-on work is what made the content really stick for me. Also, as they have an online editor I was able to use it on my Chromebook which really helped me. Now I use this to help my students in grasping and understanding basic CSE classes and also practice questions. They have a wide range of questions which helps the students in understanding the chapters and build their knowledge in various subjects.