You can delete all third-party apps you’ve installed through the App Store, Setapp, or directly from the developer’s website. CleanMyMac X will help you completely remove the traces of these apps from your Mac.
As for how to uninstall default apps on Mac, you can uninstall some of them simply by moving them to the Bin. However, there are system apps such Safari that can’t be removed — use CleanMyMac X to reset them and delete their associated files, it will help free up some space.