The easiest and free way to earn bitcoins online is by using actively a Bitcoin faucet.
I've noted down some of them which I'm using currently and earning pretty well.. :)
QoinPro : It aims to help Cryptocurrency users learn about the Blockchain Technology and rewards users in the meantime. So just for having an account, we get like 250 Satoshi, 0.00000250 Bitcoin, and then receive 2 Satoshi per day for having our account! The best thing about QoinPro is that you don’t have to login every hour to get free Satoshi. And did I mention that you get bunch of other coins as well.
Moon Bitcoin : This website will pay you 1 Satoshi per 5 minutes. Just open it in one browser and carry on with your work. You can also mine Bitcoins, Dash, Litecoins, Dogecoins or Bitcoin Cash using this network. Mining is done to create Bitcoins(in-brief). You can get 250 Satoshi per day when internal mining is done too.
Freebitcoin : This is another website which will let you roll dice every hour and pay you about 18–34 Satoshi per hour, while you can also play some game here and double your Satoshi.
You can also mine through this too and earn 200 satoshi using mining.
So, total you can earn from here is 560 Satoshi per day.
Bonus Bitcoin : Offer completely free bitcoins to visitors and also the opportunity to fill in surveys for generous payouts.
Just set up a CoinPot wallet (free) and a bitcoin wallet address and off you go!
Hope you enjoyed reading this. Upvote and keep earning free bitcoins!!