Resources: SSH Into A Server
ssh-keygen -t rsa -b 4096 -C "[email protected]"
If you have Git for Windows (which you should), ssh-keygen command should be available: https://gitforwindows.org/
You can read more about this here
Another option is to use https://www.ssh.com/ssh/putty/windows/puttygen
If you want to learn a little bit more about how SSH works internally, watch this excellent video: https://youtu.be/ORcvSkgdA58