yes bitcoin is a digital money
you can use this anywhere. online pament aur invest and saving
Is it better to save money in bank or invest it online, in real
estate or maybe gold?

If you trust bitcoin, i think better you save your money at bitcoin
i save some of my fund every week at my vault address
also i save some of that at $
I`m more into bitcoin if it ever stable at minimum of $300 or above.
Anything below is seems not worth and just leave it with gold or pay the different in the rate volatility.