Coinbase: Earning Crypto While Learning
This feature I think started from them but these days, it's not only them that offers this but almost every exchange has got this now. It's a good way of introducing to the newbies and giving them some opportunity to earn a bit from the specific cryptos that will sponsor this feature.
I also think that websites like CMC and coingecko have this feature and if you're into grinding of earning from these, they're not really that much but it is a good way to spend your free time if you don't have a lot of things to do. Anyway, can also consider earning for free when you're like working actually and getting paid with crypto from the work that you do.
and the methods that are already well known and pay are airdrops and bounties, from the beginning crypto began to be known to many people, airdrops and bounties are the best way to get coins from several released projects and then give them to those who help their projects, and it cannot be denied that the community has become one of the keys to project success.