Yes it is true, and for the interest of the bank is very low, in my country not even more than 0.1 percent, I do not know how the calculation of bank interest even though there is written interest bank 11% per year but I get no more than 0.1%.
Better to do both. Save money for the money to pay the bills and buy food everyday. And make sure the currency you save does not change so you do not experience profit and loss. Because the money is only used to meet the needs of every day only.
Make an investment. So that money in your savings can be increased and doubled. Do not just save money, but we also need to invest. I do not think there are any rich people who do not invest. Every rich person will always invest to supplement their money. But we must know very well what it is investment. Do not just invest into something we do not know and even lead to scam or fraud. The easiest way is to invest Bitcoin.