Hi understanding PD can be a challenge and the way the individual with PD chooses to handle having the condition is completely personal. It sounds like your friend is lucky to have such a caring friend, who wants to understand the condition. I shared a few basic articles on PD here - https://parkinsonsdisease.net/basics. And https://parkinsonsdisease.net/basics/stages. And https://parkinsonsdisease.net/basics/myths-misconceptions-facts. If there is any specific information that we help locate, please reach out. We are happy to help you better understand what living with PD is like for your friend. Kindly, Jessica (Team Member)