Taking Screenshots is one of the most common things you do on your Mac. I use third party Apps for this at times, but I still take a certain amount of Screenshots using the macOS. The Screenshot feature has been enhanced nicely in macOS Mojave and Catalina. This video by Gary Rosenzweig covers just about every Screenshot feature available. It is well done, and very thorough. You can know a lot about the macOS Screenshot feature, but I can almost guarantee that you will learn something new in this presentation.