In the past, I would have said faucets, but there are fewer and fewer reliable ones (the most famous, freebitco.in, is having issues), and they're mostly going to be a waste of time.
First Bitcoin faucet gives 5 BTC for each claimer.
Some casinos still have faucets but value is very tiny and it's available to claim for gambling with fun. It's no longer faucet that can help you rich. List Of Crypto Casinos with The Best Faucets