Where to Save for a Rental Property

[John Akhlaghi]

Good Evening This is John Akhlaghi, 

I was hoping if I can get some information on where to put the savings that I save up for my next property. 

I currently have it in an Ally high-interest savings account, but I was thinking that I should open up a Vanguard account and put something to vtsmx. 

What are your guy's current thoughts on this do you think I should put the money I earn and just keeping saving it or put it into stocks? I am just worried if the market dips or that I will have to pay capital gain tax but at the same time, I just don't want to have my money sit there and earn nothing.

Thank you, and have a great day.