Apple has gone to almost all SSD drives in their Macs which usually means smaller hard drive space. The SSD’s run great, but there usually is not as much room for your stuff. SSD’s are expensive so we can only afford smaller sizes. Because of this people are monitoring their hard drive free space more diligently. The easiest way to do that is using the Finder in macOS. This article describes several different ways to determine hard drive usage using the Finder.