Noteworthy: Lunacy has great onboarding
Lunacy is a free Design/Whiteboard software (like the popular Figma).
I installed it to take a look, and the onboarding process is great.
It’s visual, it’s incremental, it’s interactive, it includes reasonable fallbacks, offers alternative mouse or keyboard interaction.
It’s directed, but you can do and skip ahead or zoom out and skim over.
I noticed a few things being outdated though. (For example, the context menu “copy style” action is in a submenu now, but not so in the screenshot.)