I echo what deadzone said regarding ProShares. They have inverse ETFs (which attempt to return the opposite of the Dow, S&P or NAZ. And they have ultra inverse ETF’s, which attempt to return twice the opposite of the indicies.
Currently, I have a decent amount in QID (ultra inverse the NASDAQ). Mostly in stable accounts now, but have about 10% or so in QID.
I also agree with others who caution you to be careful. I think that is always the case. Stocks, home purchasing, etc. But if you do want a short position, these funds are an easy way to do it.