How to configure Apache SSL purchased in reg.ru?

Question

Apache HTTP Server

Good night all.
I'm not actually a server administrator (I don't physically have one). But there is a problem, there is no solution. Google issues links only to solutions with their own certificates.
I bought a certificate on reg.ru and they gave this information:
- Certificate request (like a csr file)
- Certificate in .crt format
- Root certificate (not an understandable format)
How with these three files (I don’t even know what extension the last one should be) configure access via https on apache?
The certificate is activated, ready to use.
I understand that I have to create a new virtual domain on port 443, specify in the settings where the certificate is located, but on different sites all this is described differently. Somewhere it is indicated that a .key file is needed somewhere it is not there !?
I will be glad for any help. Thank you!

Answer 1

There still somewhere there should be a key from the certificate.
And so - at reg.ru themselves, you can also read a quite sensible manual - https://www.reg.ru/support/ssl-sertifikaty/ustanov...

Answer 2

Before creating a certificate request (.csr), you must have generated a key pair.
Describe what you did and what you got in more detail.