I've never won anything from an airdrop, I have no idea how to know which ones can give coins.
Can anyone give a tip on where to search? Is there any place that reports on this?
The golden years are over. A couple of years ago you had pretty huge airdrops that gave a lot of people a nice extra (i.e. bitcoincash) but nowadays it is hard to find real good ones. Don't get me wrong, if you google around, you will find hundreds of airdrops but none of them are really worth anything. The requirements to join one are real easy though.