What level is this geared towards?
If you can walk into any situation and understand the light to know how to position your subject/yourself for the best possible image, then this may not be for you. Think full sun, no sun, mixed light, contrasty light, harsh shadows, and then metering for said lights, finding good light, dealing with color casts, etc.
This is great for any photographer wanting to confidently work with many types of light. Also great for wedding photographers that will need to trouble shoot on the fly in a variety of lighting situations.
Q
Is this for film or digital shooters?
Both! This is about all the different kinds of light, recognizing it, and it's troubles. You'll learn how to troubleshoot and adjust accordingly for the best possible images. Light behaves the same regardless the type of camera or medium. It is about positioning yourself or your subject appropriately to get the outcome you would like in all types of light, and truly understand the differences in the light and colors of light.
Testimonials
Just spent part of my morning going through Caroline Tran's All About Light Course....and guys...you need to check it out! Especially if you are still learning about the types of light and how to troubleshoot through them.

Sometimes as photographers we find ourselves in variety of lighting situations. Not only does she explain all the types of light (including color), but how to shoot in it. It's full of videos and visual examples as she walks us through.