I’m an electrinics engineer and did a lot of different things:
worked in my fathers TV repair shop
designed and built CCTV-systems for small villages
repaired, designed and built industrial control systems
started teaching adults in electronics from the mid 70s
teached accounting
was Quality manager, IT security manager and CTO of a mid sized company w 600 PCs
was CCNA, teacher for CCNA, RHCE, RHCX, MSCE
now I am retired