1. Version Control

• Open SourceTree
• 'File' -> 'New' -> 'New' -> 'Create Local Repository'
• 'Repository type': Git & Select 'Destination Path'
• Stage & Commit

If you want go to certain version, right click it and select 'checkout'

2. Working Together

2.1 On MAC

• Open Terminal

ssh-keygen
# then set password 
cat .ssh/id_rsa.pub
# then copy the key content

• Open www.github.com
• Profile Settings -> New SSH Key -> Input titile name & paste the key content
• Copy Repository URL from Github
• SourceTree -> Repository -> Repository Settings -> Remote -> Add -> set Remote name to be origin & paste URL

Now we can upload our change to Remote

click 'origin' -> click Push icon -> click master branch

• accept server's key: YES

Now you are gonna load your own SSH key to identify yourself to the server. If you are on a mac, you only need to provide your paraphrase if you saved the key at default location. In windows, you can use PuTTY SSH key agent, 'Pageant'