There are some websites that i used untill now.
1.
https://bountyplatform.io=> There are many good project on this platform. Especially, it's have exclusive bounty that surely you can receive token and it have 80 90% can listed on exchanged (that's my opinion)
2.
https://beta.bounty0x.io/bounties=> Really good. Because there limit participant so the reward very big (you can earn 2 or 3 ETH form 1 project)
3.
http://bounty.cool/=> Update good bounty, detail and quality. You can chose which one you like best to do.
There are 3 websites that i usually entry to find and do bounty. Hope these information useful for newbie (like me).
Have a nice day all guys