I created a crib sheet for the #Helix text editor:
https://www.bobulous.org.uk/coding/Helix-crib-sheet.html
As usual I intended the new page to be compact and concise; and as usual it ended up being huge and rambling. Hopefully it'll still be of use to people who aren't fully familiar with the most useful keys and commands. (And just maybe of vague interest to #Neovim users who are thinking about trying Helix.)
Let me know if you spot anything incorrect.