Either balenaEtcher or Raspberry Pi imager should work
Advanced settings under “Wheel settings” will not work for FydeOS images
If you wish to utilise OS OTA update in the future you need to perform an installation process, it could be from your SD card to a USB stick, or from a USB stick to an SD card, doesn’t matter the order, as explained here
Not sure if all of the above did answer your questions, I was having difficulties in understanding what you were asking
where found Default Password/username/hostname…? for:
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If you wish to utilise OS OTA update in the future you need to perform an installation process, it could be from your SD card to a USB stick, or from a USB stick to an SD card, doesn’t matter the order, as explained here
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