I am brand new in bitcointalk. I want to participate in bounty campaign. Can I?
As far as I know, you are free to join bounty campaigns as long as the manager allows brand new users to participate into such.
Be cautious, however, as most users who join bounty campaigns (not everyone) are also the ones who contribute to dozens of spams throughout the forum. Newbies also tend to create spam posts and over-asked questions that were answered a long time ago. If you do wanna earn alternative income, I highly suggest improving your knowledge in cryptocurrencies and share your insights on them by providing/creating useful threads.