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Let's Encrypt is 10 years old today !
(letsencrypt.org)
This is a most excellent place for technology news and articles.
They also made it a open protocol (the ACME protocol), so now there's a bunch of certificate providers that implement the same protocol and thus can work with the same client apps (Certbot, acme.sh, etc). I know Sectigo and GoDaddy support ACME at least. So even if you don't use Let's Encrypt, you can still benefit from their work.