Let's encrypt + certbot: where is the private key?:
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Ignore the csr and keys dirs; they essentially just contain temporary files during issuance.
Certbot always puts the latest version of all certificates under /etc/letsencrypt/live:

Therefore you would configure services like this:
*Need to be root (sudo su):

SSLCertificateFile     /etc/letsencrypt/live/branden-g.ca/fullchain.pem
SSLCertificateKeyFile  /etc/letsencrypt/live/branden-g.ca/privkey.pem



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Source: https://superuser.com/questions/1194523/lets-encrypt-certbot-where-is-the-private-key
Date: April 22nd 2023