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 honestly: when I first got into Linux coming from Windows, a history lesson would not have been what I wanted, rather something practical, even hands on. But "basic" can mean a lot of different things and I do not know your audience or their expectations. Just a thought. Really great you take the time to do this!

@grob

Absolutely, that's why I plan to spend not more than 20 minutes on the history of Unix/Linux - and go straight to installing it :)