The worst I encountered was a somewhat lengthy manual to build a project (cannot remember what it was), and not only did you have to manually install all required dependencies -- npm automates this by having an npm-readable list in package.json -- but after running all those commands, the last note said something like "oh BTW, whenever we wrote "pip" above we actually meant "pip3", use that instead, and if you did it wrong, there's no way to undo it."