I have just joined into the bounty program, please show me some good bounty! thank you very much 
If you're looking for bounty campaigns, you can go to bounties section. There's a lot of good bounties in there, but there are also some bounties that are scam. And if you're really interested to participate in bounties, you have to level up first your rank, because newbies are strictly prohibited to participate in any campaign including bounties.