How do I work an Apple Watch?⌚️🤷🏻‍♀️

Li

This last Christmas I received an apple watch 3 to replace the fit bit that stopped working on me. I had used it to monitor my vitals. I have slightly elevated blood pressure and used it to monitor my heart rate during my daily activities and my work outs but I have yet to figure out how to really use my new smart watch or find an app to get the most out of using it. Can anyone give me some ideas?