You can change the name to your company name or your product name or say 'hi' to your prospect, whatever it is. The rest of the stuff is very useful. The page description and keywords, very useful in SEO, if you are paying attention to SEO, but most people using ClickFunnels aren't overly concerned with SEO because they're driving traffic with either JV, Joint Venture Partners or affiliate partners who have email lists, or they're driving traffic with Google AdWords or Facebook Ads, something like that.
A well-designed landing page can greatly increase conversions for your PPC or email marketing campaigns. Rather than directing visitors from those sources to your general website (where they may have a hard time finding what they’re looking for), you can direct them to a specially-designed landing page that steers them in exactly the direction you want them to take.
Principle of commitment & consistency -- When people commit to something, they're far more likely to purchase from you. That's why getting them to agree to something like a free + shipping offer or by agreeing with something you've said in some way. This is a powerful principle in sales and if you pay attention to some of the best marketers in the world, you'll notice that they work fervently to get your commitment to something, even if it's very small in the beginning.
Prospecting and marketing are all the things you do to get people into the first of your sales funnel stages. Note that stages are broken into two or more steps wherever possible. A demo could be called a single stage, but in real life it involves a lot of things: contacting the customer, sending reminders, doing the demo, and then following up. Whatever your own sales stages look like, the support you need in managing them will be the same.