https://jamesachambers.com/raspberry-pi-ubuntu-server-18-04-2-installation-guide/
WiFi:
USB disk:
https://raspberrytips.com/format-mount-usb-drive/
Komodo on ARM:
https://github.com/KomodoPlatform/komodo/compare/master...MercerWeissAlt:dev-aarch64
https://github.com/MercerWeissAlt/komodo/blob/dev-aarch64/zcutil/build-arm.sh I guess that the cross-compilation for ARM should be performed similarly to the cross-compilation for Windows.
Hush on ARM:
https://github.com/MyHush/hush3/blob/dev-aarch64/zcutil/build-arm.sh (To update)
Other links:
https://bitcoin.stackexchange.com/questions/47892/how-to-change-the-data-directory-with-bitcoin-cli
https://www.raspberrypi.org/documentation/configuration/external-storage.md