Hi Himanshu

If you want to learn Android App Development, there are many websites like Udemy, Internshala online courses, Intherntheory so on. They even give you Certificate of Completion.  You can also join the Coaching centres in your local.

If you have already learnt and looking for internships, projects or jobs, look on the websites like internshala, interntheory, letsintern etc.

Regards