https://www.cboe.com/tradable_products/vix/vix_options/
When trading the VIX, you are trading the implied volatility not the actual (realized) volatility.
VIX represents the implied vol of options on S&P500 expiring 30 days into the future.
Trading the realized volatility is not easy :)
https://www.cboe.com/tradable_products/vix/vix_options/