Using a rim light is a great way to separate your portrait subject from the background.
In this tutorial, Andrew Boey of the Beyond Photography Academy not only provides a deep-dive into how to position them, but also how to calculate the proper flash output power based on where your lights are placed.
Boey has created what he dubs the "Lighters Cheat Sheet"—a handy reference that helps you determine your exposure based on how close your subject is and what light modifier you're using.
He also dives into adding flash gels to rim lights for a more creative effect. Check it out.
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Via: ISO 1200