For me, it has always been repetition. The more you use any command, the easier it is to remember it
Off the top of my head, I use the following regularly enough that I remember them quite easily...
sudo apt-get update
sudo apt-get upgrade
sudo apt-get install <package name>
sudo apt-get remove --purge <package name>
sudo apt-get install -f
sudo apt-get autoremove
sudo apt-get clean
sudo apt-get autoclean
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