Bluegrass Rhythm Guitar resources

I am looking for some good resources for bluegrass rhythm guitar. I was asked to teach a small group of beginners and I have fallen down a rabbit hole of “what is bluegrass rhythm guitar” anyway!? I am very interested in what people think are some of the fundamental and definitive aspects of bluegrass rhythm and what critical things beginners should be informed of. Thank you for any recommended resources, insights or feedback. Pamela