I’m creating an online course to help people with a major pain point they have. I have posted some of my content on YouTube and have a lot of good feedback, but want to market my course via email. How can I get emails?

Create a lead magnet that is aligned with the people that you want to serve, and add it to the description of the popular video. The goal is to get the people that like that video content to sign up for something related.

Say something like, “If you like this, you must get your hands on my free resource to XYZ, which will take you to the next level.” Make sure you put a call to action in the description directly below that popular video. 

Then start nurturing that email list because when you nurture them, they're more likely to buy. 

You should also retarget the video views on YouTube with a really great lead magnet via paid Google ad. That way, anyone who watches that video sees an ad for your new lead magnet that you created. That's how you turn that interest into actual leads.