Recommended ssh-keygen command:

ssh-keygen -t rsa -b 4096 -C "[email protected]"

Windows: 

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

pbcopy command: https://superuser.com/questions/472598/pbcopy-for-windows/1171448#1171448

Extra Video:

If you want to learn a little bit more about how SSH works internally, watch this excellent video: https://youtu.be/ORcvSkgdA58