I also think prevention is what I know most about. It gets talked about a lot and, frankly, there isn't a whole lot to know. No tanning beds. Use sunscreen. Wear protective clothing and gear. Avoid direct sunlight in key hours. Not that those aren't super important, but there's not a ton of things to know to really help yourself stay healthy. As far as diagnosis and treatment, that runs the gamut since there's different types of skin cancer with different levels of treatment, etc etc. Good to know a little about all of them I think but prevention can keep us from needing to know the rest!