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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.
HTTPS certs used to be very expensive and technically complicated, making it out of reach for most smaller orgs. Let's Encrypt brought easy mass adoption and changed encryption availability on the web for everyone.
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.