Where's my homepage???

For some reason my website was not navigating to my homepage and I could not for the life of me work out how to get it to do so. I have a mate who is a tutor for Web Engeneering so I hit him up for some kind of explaination. He said the server will automatically navigate to index.html . Once i'd changed my homepage to index.html it loaded up and the website is complete. YAY