1) Duplicate content
2) Over-optimization, Keyword Stuffing etc
3) Linkbuilding
a) Sudden increase in links
b) Same anchor text used again and again
c) Links from bad neighborhoods
d) Spammy links? Whatever you think of
If you are using wordpress then My advice is Use a Unique Theme For Good work.
Do you think Google hates WordPress I think No What Do You Think
Waiting for your Advices So Give Replies about This.