DNS・ドメイン周りと、Let's encryptの調査

Let's encrypt & SSL証明書

https://letsencrypt.org/ja/

https://zenn.dev/dai0916/articles/58923df5c8e8818d02f7

https://www.kagoya.jp/howto/

https://ssilab.co.jp/blog/tech-blog/tech-blog-child/lets-encrypt_wildcard

https://qiita.com/AkiQ/items/db4eb8c7106f109819f0

https://ssl.sakura.ad.jp/column/letsencrypt/

https://www.stream.co.jp/blog/blogpost-42894/

https://loumo.jp/archives/23131

https://qiita.com/tiger2021/items/1091299b675efeb2c6ee

https://zenn.dev/d0ne1s/scraps/303a400331ba4b

https://qiita.com/moyashidaisuke/items/7d5fee3a81466c83875f

https://teratail.com/questions/57658

https://marycore.jp/mac/mac-install-root-certificate/#google_vignette

DNSのレコードの意味

https://help.onamae.com/answer/7883

digコマンドとは？

https://www.linuxmaster.jp/linux_skill/2019/04/dig.html

https://hogetech.info/network/command/dig#google_vignette

ドメインとサブドメイン

https://college.globalsign.com/case/website-04/

https://tanweb.net/2018/06/18/21515/

ローカルホストをサブドメイン化する

https://nishinatoshiharu.com/use-subdomain-localhost/

https://qiita.com/1ain2/items/194a9372798eaef6c5ab