How to learn mobile application development?

Hey friends I am looking forward to learn about mobile application development for java/android/iphone. Before this I want to know will making mobile apps be fruitful in terms of return of investment. I am looking for some tutorials that will teach me about it, but I am still a beginner, i only know a little about programming languages, but i have worked before with Visual Basic, so where should I start? Please suggest.

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