<prompt> Human: What are the best funds for this?Im quite clueless about investing, Ive been maxing out my 401k and Roth IRA with the vanguard retirement funds.Now I want to open a brokerage account and apply the same concept of set it and forget it.I want X automatically invested from my account every week, but Im not sure what the right fund is.Ive heard VOO is a good one, but Im not sure.Any advice?Assistant: For Automatic Investment, youll have to use mutual funds rather than ETFs. The equivalent for VOO would be VFINX.Human: Why would I need to use mutual funds over ETFs?  <response>: ETFs you have to buy whole shares. Mutual funds you can be fractions of shares. So if a share cost 75 and you wanted to buy 100 worth, youd get 1 share and have 25 left over. But if the same was in a mutual fund youd get 1.33 shares with 0 left over. 