It depends on what the person was trying to accomplish in their first week of using Linux. Did they see a certification book for LPIC or Linux+ and get interest

It depends on what the person was trying to accomplish in their first week of using Linux. Did they see a certification book for LPIC or Linux+ and get interested to go through it? They will for sure hit these commands in the first week of using Linux than. Using Linux for objectives that are not Linux administration you will probably not hit these commands. You probably won't be dealing with the partitioning of your hard disk if you use a graphical installer and let it partition things automatically. That knocks - fdisk, gparted, parted, lsblk, and blkid off the list. I wouldn't even expect someone that uses Linux as an alternative to Windows to use ps, netstat, or top. I would expect them to encounter the package management commands though: apt, pacman, yum, dnf.