My page doesn't show up

I am trying to build my website with github services, but when I enter the page I get a 404 error, I don’t know if I have an error in the code or not, I am new to programming, this is my first web page
https://arcanox98.github.io/FirstWebtoSaito/

URLs are caps specific and Index.html with a leading cap isn’t a default index page.
https://arcanox98.github.io/FirstWebtoSaito/Index.html