When it comes to the safety of the money of course bank is one of the safest.But if you want your money to double or tripple or even more you can put/invest it in crypto but no assurance.
On the Internet, today there are several exchanges, where after registration you can buy both bitcoins and popular altcoyins. The funds can be sold at any time (exchanged for another crypto currency) or withdrawn from the system to a bank account or electronic wallet.