I have just joined into the bounty program, please show me some good bounty! thank you very much 
We can not show you good bounties. You can choose in the bounties section. You need to look at certain things in order to understand what is good and bad. I think you will learn over time.
He needs to understand simple concepts like the strength of the team and their promotional ability (ie: shilling). A website that lists every (?) bounty available is http://bountiesalert.com/. Good luck.