My favorite thing that I learned was keeping it simple because a confused mind won't buy. Websites can be super complicated and have multiple tabs ect. You could basically get lost. A funnel is like a guided tour that shows you exactly where you are headed and keeps guiding you to the end of the line without all the distractions that come with a website. Yes, a website can make sales, but a funnel will almost guarantee that you make a sale because that's where you're headed.