Is it true that learning html we can apply to update windows and we cam do website pages.

Answer 1

um... updating windows? no. although windows usually forces you to anyway.

website pages? yes! html is essential to making a web page.

Answer 2

I'm not 100% sure about your question, but there's also this:

"Microsoft HTML Help is the standard help system for the Windows platform. Authors can use HTML Help to create online help for a software application or to create content for a multimedia title or Web site. Developers can use the HTML Help API to program a host application or hook up context-sensitive help to an application."
https://msdn.microsoft.com/en-us/library/windows/desktop/ms670169(v=vs.85).aspx