"OK" LED is 17th GPIO pin about bakingpi-www HOT 2 OPEN

Hmm, this is an interesting one. The debate here is, is the GPIO0 pin the "first (1st)" pin or the "0th" pin. Looking at my descriptions, I also talk about the 16th bit in a register, which implies I have a 0th bit. Perhaps it's worth a clarifying comment to be explicit about what I mean. Alternatively it could be rewritten to say "pin 16" and "bit position 16" with a note somewhere saying that "pin 0 is the first pin". It may even be a nice opportunity to describe off by one errors 😉

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Yes, definitively! I have a programming background, so I'm somewhat used to count from zero, but I guess it can be difficult for newcommers.
I like the idea to use different naming "pin 16" vs. "bit position 16" (although this still is ambigous if there was no prior notice whether there is also a 0th bit/pin). Maybe this can be underlined with an indicator (color, symbol, etc.) to always make clear which counting method is used and a box explaining the meaning of the indicators.
It could be quite useful to explain the off-by-one error, e.g. in the troubleshooting section.

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