I am currently working on a basic course about #Linux for people in my local Makerspace.
Ofcourse, you can't really understand Linux without knowing how the state of Unix where in the 80's and 90's - so ofcourse, I am spending atleast 20 minutes talking about it.

What is an aspect that I should'nt miss?
Ofcourse, I'll bring up #GNU and the role if played for the success of the Free Operating System that most of us refers to "Linux" today.

Anything else?

@selea If its got stuff about installing the OS then I would make sure to put in fixing common pain points with the process (drivers for wireless cards + nvidia gpus, finding specific fixes for your hardware, setting windows to work with a utc hardware clock if doing a dualboot)

also maybe have a brief list of machines that you shouldnt attempt to install linux on if you can get a short list of commonly-owned machines that can easily get permanent damage from attempting a linux install (ive heard an anecdote of an attempted ubuntu install permanently frying all the usb-a ports on a laptop. iirc it was a blue asus zenbook, which doesnt narrow it down since there are multiple asus zenbooks that are blue, but that line is rather popular so if you can find discussions of this consistently happening to a lot of people then maybe include it. as an example with actual evidence of it happening to more than one person: samsung (iirc) laptops could get bricked by the uefi variable space overfilling and they didnt have a check to prevent this).

you could also do some examples of hardware that works well with linux (both full machines like thinkpads and components e.g. amd and intel graphics cards, intel wireless cards) and machines with linux preinstalled (do dell still provide this option? valves hardware, and smaller vendors like system76, starlabs, etc)