There are many ways  to earn bitcoin that we can do but we just need maybe a investment or a hardware for us to get started earning ..,
Many people earn just a cent trying to earn because they don't have equipment and lack of knowledge in bitcoin
Here are some ways to earn bitcoin:
Mine your own Bitcoins. The very first way to get your own Bitcoins was through mining. ...
Do work for Bitcoins. ...
Offer something for Bitcoins. ...
Gambling and casino games. ...
Use various Bitcoin faucets. ...
Boost your trading skills.