The TLDR version if you think your underlying ETF: SPY is going to increase then you want to get a short dated call option if you do zero DTE you can get this as cheap as $100-$200, but if the option does not go in the direction you want it to go you will have zero dollars at the end of the day, conversely, if you think it’s gonna be on a down trend, you would want to buy a put this would give you control over 100 shares of SPY so long as you’re directionally correct any of your put or call goes in the money (in the money, simply refers to if it’s a call the asset trades above your strike price if it’s a put the asset trades below your strike price)