In some of the threads I'm following lots of users mention the word "bounty campaign" or "bounty manager" which is a term I've never heard before. Is it something similar to a marketing campaign?
As you will stay on this forum, you will understand everything. Just do reading here and you will find answer to all your questions. Anyway, they already answer your question, Bounty Manager is the one who managed the Bounty campaign, the project which is similar to marketing. It composed of different types of campaign which you can join. You can promote the project to earn money through the coins they will pay. As a newbie you can join first to different social media campaign then later in signature if you rank up.