Best app to learn Ethical Hacking?

Answer 1

Mitnick and Spyboy are the two android apps to begin to learn ethical hacking.

Answer 2

EC-Council will be your best bet. While this question is a little vague, I would strongly recommend against unethical hacking practices. On the other hand, a clever solution to a problem can be considered a "hack". So, a little more details can help determine your direction, motivation, and purpose. Best of luck.