If you are dabbling in options, no matter what you do , understand how the Greeks affect your positions near expiry. Often, a seemingly 'no-brainer' winner ends up biting the dust.

As an example, for cash secure puts, when do you pivot to cautionary mode : (1) Delta on the short put has moved from 0.20–0.35 at entry toward 0.45+. The market is now pricing assignment as the more likely outcome. (2) DTE has dropped inside 21 with the stock at or below the strike. Gamma is accelerating — the position becomes faster-moving from this point forward. (3) he stock has broken a key technical level (support, 200-day moving average) (4) A negative fundamental event has landed — earnings miss, guidance cut, regulatory news, sector downgrade and the original reason for selling the put no longer applies. (5 ) Broad market is selling off and the stock is moving with it, not for anything company-specific. So what are the Greeks doing : Delta - Entry for a typical CSP is around 0.30 delta — roughly a 70% chance the put expires worthless. A CSP's delta rises as the stock FALLS (not rises). When delta climbs to 0.45–0.60, the stock has moved meaningfully against the position and the market is pricing assignment Gamma - at DTE with the stock well above the strike, gamma is low and the position is stable. Under 21 DTE with the stock near or below the strike, gamma becomes aggressive — delta can swing 0.15–0.20 on a single 3% stock move. Theta (the paycheck) - Theta works in the position's favor every single day. It accelerates in the last 21 days and peaks in the final week. The 50% max profit early-close principle is followed, it captures most of the theta reward while stepping aside before gamma becomes difficult to manage Vega - small effect but a short put position is short vega — rising IV raises the price of the put, which raises the cost to close the position. Imagine when a put is sold on a stable stock at low IV, the stock drops 4% on sector news, and IV jumps 10 points at the same time. The put is now 40% more expensive than simple price-movement analysis would indicate. Different strategies show differnt behaviour of Greeks .. Happy trading.