Build ssh confidence

For normal server:

1. ssh-keygen -t rsa
2. ssh-copy-id user@remote-server

For github:

1. ssh-keygen -t rsa -c "your_email@youremail.com"
2. xclip -sel clip < ~/.ssh/id_rsa.pub # copy to clipboard
3. paste your key into the "Key" field in your github account