Almost everything. I don't know much but I know enough to grab a tea that specializes in whatever my ailment is (ie; mullein for a cold) and it works. So I'm learning as I go. As a diabetic with high blood pressure and all sorts of other ailments who got tired of doctors never knowing and even lying on my records I knew I needed to get proactive and get off the pills. I couldn't be happier! Was being hospitalized about once a year to year and a half. Since I quit going to the doctor's I've not been in the hospital and my infection that I kept getting cleared up. People are so brainwashed into believing they need big pharma that they've forsaken all the good nutrients that grows free in their yards, local parks, and so forth!