Best coding language for app development..?
Java and XML for android app development and Swift for iOS development. Check this link for tutorials: https://www.sololearn.com/Discuss/242006/for-all-budding-app-developers-here-are-some-useful-links-for-you
Android go for Java and go learn the tutorial specifically for Android after you grasp the basic of Java iOS go for Swift
Here I come back with this result:- different people will tell you different different language... don't listen to them.... instead of searching for the best.... you should select one which is good for app development and which is famous 😊😊😊😊😊
Android? Java iOS? Swift Cross-Platform? ReactNative, Xamarin