I have 2018 13'' MBP. 1. When I go to Storage in 'About this Mac' there is a part that says 'Other volumes in container' that takes 4.97 GB, What is that ? 2. In finder when I go to Macintosh HD there is a folder named 'vm' that have a swap file 1.07 GB, What's this again ? 3. Which is better or which is the intended ? Closing Apps windows or quitting Apps completely ? For example: should I always close Safari windows when I finish browsing or quit Safari ?