And then some people wonder, why the year of the linux desktop still has not arrived. But luckily no, unless things went very wrong, a newbie will not have to invoke those commands - and if he indeed has to, he or she will likely just give up anyway.
(Btw. I use linux since years and so far only had to use half of the listed commands.)
fdisk, on the other hand, was a thing in the DOS/Windows world, too, back in the day, and dealing with partitioning is something you are going to do regardless of the OS you are using.
inxi is a new one for me.
Command usage / knowledge depends on what you need and why.
For me, too. I was surprised to find it already installed on my system. :)
How do you write disk images (like, if you're installing a new machine and you need to write the installer to a USB drive)? I always use lsblk to find the right device name, then dd to write it.
I just make sure I point at the right device letter.
For all it worth in the last 10 years I never need to bother with it, because in the worst case I write the installer in Windows environment and when I install it on the machine (be it a hardware or a virtual machine) it doesn't matter.