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.
I totally agree with that.
There are many websites where you can find bounty campaigns. Which are good or bad, you have to decide for yourself.