How to setup ssh-keys to authenticte with a linux server

Step1: create new Key (Skip this step if you want to use an existing key)

ssh-keygen

Step2: Upload the Key

ssh-copy-id -i <path to key> <user@host>

Step3: edit ~/.ssh/config. (You might need to create this file first. Thats normal) Add the following lines

Host <hostname>
    HostName <hostname>
    User <user>
    IdentityFile <path to key>
    IdentitiesOnly yes

You should be able to login now.