Yes it's true but it will need some researching so you will know how everything works. If you already know that then its possible to make bitcoin as passive and stable source of income.
I don't think anyone on this planet knows how everything works, not in general, but even with bitcoin. What we can do is to hold and hope that the price will rise in the future. It looks like an easy job, because there are more chances that the price will rise indeed rather than will go in another direction, but sometimes we sell for some reasons, and regret it later when we see that the price has risen.
For me, if you are going to apply for a certain job, it is important if you have a background about it. Having knowledge on the job that you are applying for will be helpful in performing your work. It is not necessary to know everything about that job but knowing what job and duties you are going to do will be an advantage in fulfilling it.
Bitcoin surely gives an income online. Joining signature campaigns and altcoins is an opportunity to earn online without needing to meet your employers face-to-face. No interviews needed, no proper attires required and no pressure in interviews. I have been earning bitcoins and I can truly say that through it, I can now attend to my financial needs without asking for money from my parents.
That's the kind of income bitcoin provides for me too. You can't rent a flat and you can't live ansolutely independent with the income, but at least you don't have to ask for money if you are going to a cafe with your friends or if you want to buy a book for your study.
It is the benefit of earning bitcoins online, we can now support our financial needs without asking money from other people. I can’t say that I am 100% financially independent from my parents because I still live with them but at least I can now pay for my personal needs, school projects, luxuries, hangouts and etc. without asking money from them. In fact, I share my earnings with my parents because I know that they will be happy if I do that.
Earning bitcoins online really gives an advantage in life for me, not just by being able to have my own money but because I am very proud that even if I am still studying I can already share some earnings with my parents.
That's what I can say about my life too, so yeah, bitcoin has helped me a lot. Only I can't say I share my earnings with my parents, you are better than me in that.
Maybe when I will be earning more I will try to be like you, at least you gave me a good example. 
