Having a passive income is always a good option the burden of expenses is less on the income and you are able to save more.

Bitcoins is the good option to generate a passive income,buy the coins and hold it for some time and you will get a good return as the cryptocurrency market is rising, bitcoins market has over powered the value of the Goldman sachs this market is rising and will keep on rising.
Invest in bitcoins you want to see your money to grow.