To turn YouTube viewers into email subscribers for affiliate marketing, your content should give something useful and leave them wanting more. At the end or even during your video, mention a free offer and tell viewers where to get it. It could be a free tool, a short course, or a checklist that connects to the topic of your video. Add the link to your opt-in page in the video description and let viewers know what to expect when they click it. If your video helps solve a problem or gives good advice, people are more likely to trust you and join your list. Try not to rush them—just explain why your offer is helpful. Pin a comment too, so it's easier to find the link. If anyone here has tried this method or has ideas on what kind of lead magnet works best on YouTube, feel free to share.