Not a hard working, and there are already many articles talk about that, but many students still don’t know how to do that …

The simple syntax for generating ssh key pair:
$ ssh-keygen -t algorithm -b bits -C "comments"

For example:
$ ssh-keygen -t rsa -b 4096 -C "my first ssh key pair!"

The simple syntax for deploying ssh key:
$ ssh-copy-id [email protected]

For example:
$ ssh-copy-id [email protected]

If you also have problems with ssh keys, I will suggest you to read the articles below, they are confirmed by myself, I think those are correct and easy versions, and there is no need to write them in my blog again …

• GitHub Help > SSH > Generating SSH keys
• DigitalOcean > Community > Tutorials > How To Set Up SSH Keys 
• archlinux > wiki > SSH keys

3 good articles should be enough …