Beginner Android Ethical Hacking Lessons

I want to build a solid foundation in Android security by practising ethical hacking in a controlled, safe lab environment. My goal is to understand core concepts—reconnaissance, threat modelling, common... (Budget: ₹600 - ₹1500 INR, Jobs: Android, Android App Development, Android SDK, Java, Mobile App Development, Penetration Testing, Security, Testing / QA)