Best way to use NUI in C#? Or create a main menu?

Hello, as you read from the title, whats the best way to use NUI in C#?
Or is there another way for creating a main menu?
I’ve read a tutorial but it’s written in LUA, I can’t convert at all since I don’t know well this library

is NUI NativeUI?
if yes:
you can use it if you include it in your C# script file and additionally include it in your resource directory (call it nativeui.net.dll) and use it as a server script. Make sure to load it before the script file which uses it.

Nope NUI website, html/css/javascript, also PHP, I know every of this web language so just asking what is the best way!