Can anyone tell me which language is primarily used for making a website and operating system??............ thank you

Answer 1

The languages primarily used in website building are HTML, CSS and Javascript.

For operating systems look at this page:

https://stackoverflow.com/questions/580292/what-languages-are-windows-mac-os-x-and-linux-written-in

Answer 2

The kernel is commonly written in C and ASM, and the other parts of the OS in C++ or C