Louis wants to create a website about camping. Leo says Louis first should secure a domain name. This is essentially the address in the phonebook. It's also what people will enter into their brower to navigate to it. He can secure his domain name at a wide variety of companies. Leo uses Hover, but even Google is doing it now. He can search for his choice and it'll show him options, and there's tons of extensions. The reason for all the extensions is that most .com domains are already taken.
(Disclaimer: Hover is a sponsor).