Have you used coinbase? Can you make money here or is it a waste of time? Is the site secure?
What do you mean? You mean trading on Coinbase Pro or you mean Coinbase Earn program? About the Coinbase Earn program, it is pretty difficult to get approved and earn some free cryptocurrencies for learning about them. But yes, if you get approved, you can earn up to 100USD in diffrent altcoins.