Kotlin docs are neatly organized and a useful resource for beginners, but our community recognizes that many learners prefer practical applications as a way to quickly pick up new skills. In that case, check out a BootCamp or course on the subject. The Android developers at Hackr recommend the following resources.

• Kotlin Tutorial (official docs) (kotlinlang.org)
• Resource: Kotlin vs. Java

If you're familiar with the American classic Field of Dreams, you'll know the expression, "If you build it, they will come." Unfortunately, that's not the case for mobile apps. Build it, then market it. Then, they'll come. Here are a few of our favorite resources on digital marketing to get you started.

• Google Digital Marketing & E-commerce Professional Certificate (imp.i384100.net)
• Social Media Marketing Specialization from Northwestern (imp.i384100.net)

How to follow this roadmap?

1. If you want to take one course that teaches you everything you need to publish your first app, skip to the ‘All In One’ section.

2. Start with learning Java. Most projects and tutorials you will find on the web will be using Java.

3. You can choose to learn Kotlin or skip this section. Kotlin is interoperable with Java, so it won’t hurt to experiment with it. Check out ‘Java vs Kotlin’ to see the advantages of Kotlin. Note: Kotlin became the official language for Android in 2017.

4. Now that you know the language, you can start with Android development. Both tutorials in ‘Android Development’ section require familiarity with Java. Post completion, you can check out some open source apps and try to implement on your own.

5. If you are using Android Studio as your development environment, you can refer the ‘Android Studio’ section in case you get stuck or want to explore.

6. ‘Material Design’ section is optional. You can come back to this section once you are comfortable writing apps or skip it entirely.