i heard of 30 penalty ,950 penalty rencently. how many penaly could google apply to your site? anyone notice and research it? what does penaly look like? out of index(banned ?not a penalty?) drop in serp? decrease in index? anymore?
Drop in serp is one they use most. Then they drop site or ban it if you use blackhat seo. Just do what they say and do not worry about how many penalties they have. If you follow what google tells people to do you will be fine and not have to worry about it.
What is the main reason of drop penalty? My recently was dropped from 13 to 140 place for keyword "lose poker why"