There were quite a few good educational sites back in 2014 that I happened to frequent on and one of them is CoinLearn. I don't know if it still exists but on that site, you get to chat with other 'learners' discussing things about bitcoin and crypto in general while also being rewarded just for being active. For me, you don't really have to pay for these lessons, or seek for 'lessons that pay' if you really want to know about crypto. A simple research IMO is already sufficient to enrich one's knowledge without the false promise of getting something in return. These promotions are just like free trials that asks for your credit card that will bill you once the free trial is expired.