If you have much money but you aren't use it, it's better to invest it than save the money. So you can earn passive income from your idle money. It's really good imo.
Even if you do not have much money, putting some of your money into investment is a good practice. YOu need to save first and if you have enough for a starting capital, invest them so you will have passive income. Just be careful where you are putting your money so you will not be scammed.