The RAM usage on a system is good to know for a few reasons. Firstly, it can give you some insight into whether or not it’s necessary to upgrade the amount of memory inside your server or computer. If you see the memory utilization regularly nearing full capacity, it could indicate that your system needs an upgrade.
This is a companion discussion topic for the original entry at https://linuxconfig.org/how-to-monitor-ram-usage-on-linux