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The tutorial can be downloaded here: https://github.com/gvwilson/sql-tutorial/raw/main/sql-tutori...
(gives the penguins.db file necessary for the examples)
I made a couple of my own (they're incredibly scrappy, probably won't make sense to anyone but me):
- Ruby: https://github.com/stevecondylios/ruby-learning-resources/bl...
- Rails: https://github.com/stevecondylios/ruby-learning-resources/bl...
But this vim cheatsheet was great:
- https://vim.rtorr.com/
A failed attempt was to load (very) many (e.g. about 100) pages of javascript lessons from w3schools before the plane took off, but for some reason the pages tried to refresh during the flight and I lost them all, so that was a massive waste of time (opening them all before the flight took about 20 minutes).