I am getting into airdrops and bounties recently. It is not beneficial as of now, but even if 1 out of 10 projects follow roadmap and succeed it will be worth the time and effort.
Bounties are another good way to earn free coins. I don't have much fiat to invest upfront in coins, so I chose this approach to get familiar with cryptos. Let's see where it goes. Participating in airdrops, reading white papers, following devs and code in Github - I personally learned a lot about how things work in cryptos. Good luck!