Programming Basics
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Software Engineering
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Mobile Application Development
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Mobile App Development

• Android:

  • Official

    • Android Developer Guides
    • Build your first app
    • New! Android Basics in Kotlin (CODELAB BASED)
    • Study guide: Associate Android Developer Certification
    • Developing Android Apps with Kotlin course on Udacity
    • Kotlin Bootcamp for Programmers (CODELAB BASED)
    • Android Developer Fundamentals (CODELAB BASED)
    • Android Codelabs
    • Courses

  • Other

    • /r/androiddev's FAQ
    • Android Job Interview Questions and Answers
    • Awesome Android UI
    • Material Design Icons

• iOS: see the sidebar of /r/iosprogramming and their wiki (FAQ on Github)