normal window user who don’t know what a terminal is. Most of them even freak out when they see “the black box with text on it”.

Good point! That being said I'm wondering how we could help anybody, genuinely being inclusive, on how to transform that feeling of dread, basically "Oh, that's NOT for me!", to "Hmmm that's the challenging part but it seems worth it and potentially feasible, I should try". I believe it's important because in turn the "normal window user" could potentially understand limitations hidden to them until now. They would not instantly better understand how their computer work but the initial reaction would be different, namely considering a path of learning.

Any idea or good resources on that? How can we both demystify the terminal with a pleasant onboarding? How about a Web based tutorial that asks user to try side by side to manipulate files? They'd have their own desktop with their file manager on one side (if they want to) and the browser window with e.g. https://copy.sh/v86/ (WASM) this way they will lose no data no matter what.

Maybe such examples could be renaming files with ImagesHoliday_WrongName.123.jpg to ImagesHoliday_RightName.123.jpg then doing that for 10 files, then 100 files, thus showing that it does scale and enables ones to do things practically impossible without the terminal.

Another example could be combining commands, e.g. ls to see files then wc -l to count how many files are in directory. That would not be very exciting so then maybe generating an HTML file with the list of files and the file count.

Honestly I believe finding the right examples that genuinely showcases the power of the terminal, the agency it brings, is key!

No worries! You're probably right that it's better not to assume, and it's good of you to provide some different options.