I knew about crypto, 3 years ago when I accidentally saw an ad on one of the survey sites. Then I searched for some references on Google and forums on Facebook. Faucethub and FreeBitco.in are the first sites I visited.
I tried once, and now never again, because almost all of them are scams. Logically, there is no investment yield that is fast and instant, compare it with the deposit interest rate provided by the bank.