I think a poweruser is a highly proficient and knowledgeable user. That means a Linux poweruser is comfortable configuring their system, writing shell scripts,

I think a poweruser is a highly proficient and knowledgeable user. That means a Linux poweruser is comfortable configuring their system, writing shell scripts, installing software, fixing issues they encounter, etc. A Linux poweruser understands the layout and organisation of the system, so they tend not to lead themselves down blind alleys as much as beginners do. I wouldn't consider myself a systemd poweruser, for example. I still haven't really wrapped my head around its operating model. I have to read the documentation too much, and I often think one thing is wrong but something else entirely is going on.