Ssh access using the private key

Ssh access using the private key
When I applied for an online O & M machine today, O & M gave me a private key. It was the first time I used the private key for ssh access. In the past, we usually copied our public key (id_rsa.pub) to the corresponding machine. So what should we do now? I think most people who have never done this are considering whether they can do it,
Don't hold back, Weibo is coming soon:

How can this problem be solved? google, man ssh

Assume that the public key file is key. pem 1. Set the file access permission, chmod 600 key. pem 2. access ssh-I key. pem user @ host
But !!!
You don't need to use the private key. O & M is convenient and fast, but it is still not recommended in terms of security and standard operations.