✓Every extra field costs you people. A name-and-email form is fine; a phone number field on its own will cut your sign-ups, and you don’t need a phone number to send four videos.
✓Every extra link is an exit. A navigation bar on an opt-in page is five invitations to leave before deciding.
✓A visitor who gives you an email has made a small promise. People who make small promises keep showing up. People asked for a big one on the first visit mostly leave.