In the tons of questionable airdrops, and services that provide surveys and mission impossible tasks to earn crypto.
Probably the very first thing that's not questionable and definitely not a scam is Earn.com
What's the catch? None. Participate in various airdrops, and get 1$ in equivalent bitcoin value at the time of participation + and Airdrop. If you are looking to develop a small portfolio of various cryptos that are just starting, and even get paid for it, look no further.
Several ways to earn:
Assuming you are new and learning, this place is perfect to start. With no investment at all, get regular airdrops + earn in BTC for participating. One of the better ways to learn an get into the world of crypto.