I have used openssl to create a .key and .cer file in pem format (you can read them). Now I want to create .pfx file from them. I have read openssl doumentation it says something like following command I can use
openssl pkcs12 -export -in certificate.cer -inkey privateKey.key -out certificate.pfx -certfile CACert.cer
but I don't know which one is my .cer file (certificate.cer or CACert.cer) what is differences between these two files?