Saving to buy my first House Hack. Invest it while saving?

[Gianfranco Cuello]

Hi BP community. Complete newb here. My wife and I have recently decided to start saving for the down payment on a duplex that we intend to house hack. My question is: would you simy place the money in a regular savings account ( i have Goldman Sachs bank that pays 2.25 yearly interest) or use another investment vehicle to park and grow the money as we save (index funds... etc)? Im aware of recent market volatility but would like some returns on that capital and potentially receive returns in the short term to apply to our down payment down the line. Any comments will be of great help.