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Monitoring memory usage
I forget things all the time. I regularly forget where my car keys are, even though 
they're almost always right there in my pocket the entire time. I even forget to use 
sudo
 for commands that normally require it, over 18 years since starting to work 
with Linux. Thankfully, computers have a better memory than I do, but if we don't 
manage it effectively, the memory on our servers will be just as useless as I am when 
I forget to put freshly washed laundry in the dryer.
Understanding how Linux manages memory can actually be a somewhat complex 
topic, as understanding how much memory is truly free can be a hurdle for 
newcomers to overcome. You'll soon see that how Linux manages memory on your 
server is actually fairly straightforward once explained.