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start off learning either Java or Kotlin. you need basics before you can develop on the real device. if you do that, go find GUIs or APIs that uses Java or Kotlin
https://code.sololearn.com/WGUGTp5640wy/?ref=app Here are some tutorials, extra by learners!! You can learn Dart , using Dart's Flutter you can create Native Applications.
https://www.sololearn.com/post/948611/?ref=apphttps://www.sololearn.com/post/948760/?ref=apphttps://www.sololearn.com/post/948761/?ref=apphttps://www.sololearn.com/post/948766/?ref=apphttps://www.sololearn.com/post/948773/?ref=apphttps://www.sololearn.com/post/998342/?ref=apphttps://www.sololearn.com/post/1000268/?ref=apphttps://www.sololearn.com/post/1000284/?ref=apphttps://www.sololearn.com/post/1000296/?ref=apphttps://www.sololearn.com/post/1000303/?ref=apphttps://www.sololearn.com/post/1000309/?ref=app Here are some resources where you will get android related things! All the best!
https://www.sololearn.com/discuss/1043534/?ref=app https://www.sololearn.com/discuss/311752/?ref=app https://www.sololearn.com/discuss/1748171/?ref=app https://www.sololearn.com/discuss/212078/?ref=app https://www.sololearn.com/discuss/823823/?ref=app https://www.sololearn.com/discuss/513010/?ref=app
For mobile development: https://code.sololearn.com/Wc0mkR5TeMKV/?ref=app https://code.sololearn.com/W7fkt695n2vd/?ref=app https://code.sololearn.com/W15402p78Rio/?ref=app https://code.sololearn.com/W049XB43HrqG/?ref=app
Java, Swift, Kotlin just used to develop mobile applications. Go to "learn" section
Please use search bar before posting such repetitive questions . Anyways I hope you've found ur answer .