Setup SSH Key to connect to server securely

Step 1: Generate keys in your local computer

ssh-keygen -t rsa

Step 2: Copy your public key (which you have just generated in the previous step) to the server you want to connect to

cat ~/.ssh/id_rsa.pub | ssh username@server.example "mkdir -p ~/.ssh && chmod 700 ~/.ssh && cat >> ~/.ssh/authorized_keys"

Done!
Now you can login to the server from your computer through SSH Keys (no need to enter password each time)

Optional (for server administrators): disable ROOT login through password for security once you have setup logging in with SSH keys successfully.

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