Re: Ace2 - try here….
"A Guide to Efficiently Using Irssi and Screen" (quadpoint) was my original introduction to GNU screen and it should serve most newcomers well due to its practical explanations. It might even be useful to those who are new to tmux and CLIs in understanding the important concepts.
I speculate that the main reason a lot of old software (for the sake of an example, I'll mention Debian & its wiki) is not as well documented as newer software (e.g. Arch) is due to the way Linux started and how people learned to use computers back then. A lot of what one might call old knowledge was built up "organically" through trial & error and cumulative experience (no cutting corners!). Even touch typing with correct form used to be taught at school, but no one thinks about the disadvantage of lacking that vital skill anymore when it comes to driving Linux with minimal resistance.
So there's not much remaining time/patience to write everything down when trying to just get something to work. Old users who already know how to do something won't need to write notes anymore, and younger users build new systems from scratch while also occasionally reinvent the wheel, but at least document it this time around.
Fast forward to modern times where good documentation practices are instilled into more users, along with easier accessibility and enthusiasm, and the tutorials practically write themselves.