I fear git tutorials have become like monad tutorials: everyone has their pet way of explaining it.
miniblog.
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The docs model for R packages is really interesting. Every package has docs as a PDF file, and the package server supports 'vignettes' (standalone tutorials) as a first class artifact!
E.g.
Many org-mode tutorials have a steep learning curve or assume a workflow. This great talk starts with the basics: https://youtu.be/fgizHHd7nOo
I'm also struck by how many gnus tutorials assume gmail. We're a monoculture!