One way to earn Bitcoins is to make use of faucets. The Principle is easy: After logging in you solve a "I'm not a robot" captcha and you earned some money. That's possible because the faucet website shows you advertisements. So basically they give you a share from there advertisement revenue.
I use faucets which are connected to Coinpot, a cryptocurrency microwallet. It stores all the faucet earnings made on it's partner websites. Register for a wallet on Coinpot here.
So here are all of the faucet websites:
You log in with your Coinpot e-mail address, then you can solve the "I'm not a robot" captcha and earn your coins. Between the claims you have to wait at least 5 minutes. The big advantage with these faucets is, that the amount you can claim is rising the longer you wait (except for Bonusbitcoin). It doesn't say you can claim 20 Satoshis every 5 minutes, but the claimable amount still rises. So you can earn more after a some time has passed. Important: The amount you can earn increases degressive, so you earn more in a day if you claim every hour, instead of waiting the whole day.
All your earnings from the faucets are stored in your Coinpot account. There you can convert the cryptocurrencies among each others without a fee. Isn't that cool?
I hope you can benefit from this post and earn some money with these faucets.