Apple’s new APFS file system in High Sierra has had mixed reviews. Despite the mixed reviews, it is the Mac files system of the future so we need to embrace it. One of the confusing things about APFS is Containers and Volumes. This article explains how Containers and Volumes work in APFS. It is a little technical, but if you are going to be using Disk Utility to manage APFS drives, I highly recommend reading the article.