Any recommendation. I need the best ssl certificate for a dhis2 server

any recommendation. I need the best ssl certificate for a dhis2 server.

What do you mean by the best certificate?

Any HTTPS (TLS/SSL) certificate should be capable of encrypting the communication between your clients and your server. If the certification authority is not included in your operative system / browser your users will get a nasty message about security. So I would say the only requirement is getting the certificates from a trusted / well known authority.

Some companies (authorities) offers this for a price like https://www.digicert.com/, https://ssl.comodo.com/, etc. Some other companies/oganisations have gone the other way believing that HTTPS should be everywhere and they offer these certificates for free: https://letsencrypt.org/

Many DHIS2 servers use the last one. Even this community is using a letsencrypt certificate.