site banned

Hello guys, This is first time I experienced my site got deindexed from Google search. When I search "site:mysite.com" on Google nothing shows = Means deindexed. I made it before 5 months ago and it was ranked on 1st page of Google until today when it got de-indexed. I made just ONE backlink...

Hello! : ) This is my first post on here. What I wanted to know - in a succinct summary - is how to get banned by Google. Granted, there are likely legions of ways to NOT get banned. I want to know *precisely* what I need to avoid. I think I may be very wrong about what i think is bad...