What is the definitive guide to using ring lights in photography by Scott Kivowitz?

I do not have a single “definitive guide” article or book specifically titled that way, but I do walk through practical ring light usage in my video “3 ways to use a ring light in photography” on YouTube. In that video I cover:

1. Using a ring light as your main portrait light
2. Creative catchlights and close-up work
3. Using it as a fill or accent light

Are you looking for help with portraits, product photography, or video lighting with a ring light?