F&O trading amplifies both good decisions and bad ones. Leverage means a small edge can compound quickly — and a small, repeated mistake can drain an account just as fast. Most of the damage doesn't come from one dramatic loss. It comes from the same avoidable errors, repeated session after session.
1. Trading without a market context
Entering a trade based purely on a stock's own chart, without checking market breadth or sector strength first, means trading half-blind. A textbook breakout in a weak market, against a weak sector, has meaningfully worse odds than the same pattern with the wind at its back — but the chart alone won't tell you that.
2. Oversizing positions relative to account size
Leverage in F&O makes it easy to take a position that's technically "one trade" but financially equivalent to several times your usual risk. A string of average trades at outsized position size can undo months of careful, disciplined gains in a single bad session.
3. No predefined exit before entering
Deciding where you'll exit — both for a loss and a target — after you're already in the trade is a recipe for emotional decision-making. The stop-loss you set in the calm of pre-market planning is almost always more rational than the one you'd set with an open position moving against you.
4. Chasing moves after the setup has already played out
By the time a breakout is obvious enough to catch your attention without a scanner, it has often already made most of its move. Entering late, chasing the same setup everyone else is now noticing, is a common way to buy the top of a short-term move rather than the start of one.
5. Revenge trading after a loss
Taking an unplanned trade immediately after a loss, specifically to "win it back," is one of the most consistent account-destroying habits in intraday trading. It replaces a rule-based process with an emotional one, exactly when discipline matters most.
None of these mistakes are exotic. They're common precisely because they're easy to fall into under pressure. A structured process — checking context, sizing consistently, planning exits in advance, and stepping away after a loss instead of chasing it — addresses all five at once.
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