Another tip: you really gotta watch the Greeks especially on 0DTE, 1DTE contracts. Every half hour on a 0DTE you can watch the premium drop 8-10%. To win anything off these you gotta get em just before or during a move. If price doesn't move for you real soon Theta, Greek Time, will kill your play. 1DTE contracts (trading Fridays on Thursday, like today) still fade pretty fast but not as bad as the zeroes.
Vega will kill novices. If there's a sharp price action (PA), demand jumps and Vega drives the premium up, sometimes as much as 50%. So a $1 daily call trades suddenly for $1.50 or more. You really gotta have a strong move in your favor to beat the Vega, if PA fades the option quickly returns to normal premium and you're out 30-40% instantly. Novices buy at market and pay too much, very quickly these melt away as PA fades.
Finally, notice when buying ATM contracts how the premium is highest at the strike price. As PA carries option into the money (ITM), notice how you gain very little relatively, as you are just swapping Premium for ITM value. I watched QQQ $403 put trading for $1.55 ATM, stock PA moved 50c ITM now it's at 402.50, but the damned contract gained just .15c, trading at $1.70 bid, 1.75 asked.
See how hard it is to win these reindeer games?!
But it's real easy to LOSE; if price moves away just $1 your premium will go off as much as 50c, the Delta, most important Greek of all, reckons how much your contract moves for a $1 move in stock price. $2 calls turn into $1 real fast when the PA moves sharply lower, these are damned risky toys! Near-expiry contracts have a very high Delta, they move a LOT. So, very rewarding when it moves in your favor, devastating when it moves the wrong way!
Happy New Year to all and to all a Good Night!