1.HTML & CSS:
it is used for web development.
2. Java:
it is used for web development application.
3. JavaScript:
it is mostly used to create browser games and for web development.
4.python:
it is used for web development, software and game development.
5. C++:
it is mostly used for Game Development. Such as Unreal Engine.
6. C#:
it is used for app development, desktop app, websites and for game development.
7. Swift:
it is mostly used for app development, iOS apps, mac, Apple TV.
8. R:
it is a programming language and used widely in data analytic, data scientists.