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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.
I did not have the money to pay the insane amounts these greedy for-profit certificate authorities asked, so I only remember the pain of trying to setup my self-signed root certificate on my several devices/browsers, and then being unable to recover my private key because I went over the top with securing it.