You are using cPanel. That much is quite evident. The screenshot you provided and the folder structure you mentioned are all clear indicators.
The keys in the ssh folder are used for securely accessing your server via SSH. They are created in that folder via the SSH Access tool.
The certs, csrs, and keys folders in the ssl folder are populated via the SSL/TLS tool.
The CertSage folder contains (up to) these files:
code.txt - Entered into the Code box to prevent unauthorized certificate requests
account.key - ACME production account key
account-staging.key - ACME staging account key
responses.txt - HTTPS responses from the ACME server for debugging
certificate.crt - Your leaf certificate followed by the CA bundle certificates
certificate.key - Your leaf certificate's private key
The necessary process is exactly as I've described in excruciating detail here:
Given that many of the more senior members of this community, myself included, have successfully aided thousands of help-seekers from all walks of life from all over the world to acquire and utilize SSL certificates for myriad applications and situations, I find your assessment lacking in application within this community. Admittedly, SSL certificate usage is a niche area of computing, but the detail and guidance provided within this thread should be well more than adequate at this point to write an entire blog article on the subject.