Hi friend I want to share my experience with this app. This is best app for to learn computer language and Development. In this app you can find Java php pythons vb script and c+ and many more languages. If you are studying in ethical hacking this is the best app for you guys this is my own experience. I am learning from this app last 1 month and I know some basic Codding. This is the best platform for beginner.so download from the play store and learn.