What is the programming language to develop mobile application

Question

Kindly advise me on programming language I should learn to develop mobile application and how to develop mobile application for an php existing website.

Answer 1

Flutter-----> Flutter is an open-source UI software development kit created by Google. It is used to develop applications for Android, iOS, Windows, Mac, Linux, Google Fuchsia and the web. The first version of Flutter was known as codename "Sky" and ran on the Android operating system.