Next to your headline, I'm gonna argue that your CTA (aka Call to Action) is the most critical part of your page.
1. EVERY page needs a CTA at the bottom. You need to explicitly direct your reader where to go next. Otherwise, we have what's referred to as a dead end page. And you NEVER EVER want to have a dead end page. You never want to leave the reader wondering what they're supposed to do next or where they're supposed to go or how they can work with your or how they can get in touch with you. Because if it's too much work to figure it out (read: any work at all) they won't do it. They'll leave and find someone who makes it easy to connect and work with them.
2. Sales page will require more than one CTA.
3. No one will click through if they are unsure what will happen next. Therefore it's your job to make it crystal clear what action they're taking by clicking that link or button. Pro tip: on sales pages, I LOVE to include an FAQ that literally asks "What happens next?" just for this reason.
The CTA has 2 parts.