Seven Dwarfs

USB-Boot
https://jamesachambers.com/raspberry-pi-4-usb-boot-config-guide-for-ssd-flash-drives/

wifi Power Management:off
https://wakanya.wordpress.com/2016/09/21/wifi%E3%83%91%E3%83%AF%E3%83%BC%E3%83%9E%E3%83%8D%E3%82%B8%E3%83%A1%E3%83%B3%E3%83%88%E3%82%92%E7%84%A1%E5%8A%B9%E3%81%AB%E3%81%99%E3%82%8B/

初期設定
https://jyn.jp/raspbian-setup/

最小限のxwindowインストール
https://kokensha.xyz/raspberry-pi/install-desktop-to-raspbian-stretch-lite/

Bluetooth Speaker
https://yagi.tc/archives/2017/03/25/raspberry-pi-2-bluetooth/

JCOM(ZAQ)メール設定関係資料
https://cs.zaq.ne.jp/knowledgeDetail?an=000477643

Node.jpインストール関係
https://kokensha.xyz/raspberry-pi/best-way-to-install-nodejs-to-raspberrypi/

postfix spam対策
https://ex1.m-yabe.com/archives/4373