The main thing - do not use only bitcoin. There are a lot of alternative currencies, investing in which, you can get much more than bitcoin. Participate in the bounty, invest in prospective ICO, and then you can "make money."
There are lots of ways to earn bitcoin or any cryptocurrency. If you want to be passive, then mining is good for you. You will set your computer and then it will mine money or crypto for you. Faucets are there too, every given time you can get cryptocurrency. We can also have the altcoins and other cryptocurrency here in forum. We can have money by selling those altcoins or exchanging cryptocurrency to the currency that we want, US dollars for example.