I just realized I didn’t post this compilation here, just Reddit.
So for your reference:
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OP-Z Reference Guide by Rick Cohen: link
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Making sense of the OP-Z guide by Tina Aspiala: link
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Another one (by unknown?): link
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OP-Z Cheatsheet by Alex Olwal: link
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OP-Z Chtsht (back panel format) by marcusande: dlink | github
If you know more cheat sheets or similar, not listed here, drop it in the comments and I’ll update the list!
Caveat: Some of these cheat sheets may have outdated or simply not have complete information because of new firmware releases, etc. Always cross-reference with the official user guide when needed.