The strategy itself is straightforward. The behavior around it is where most of the actual risk lives.
Buying undervalued companies requires sitting through long stretches where the market disagrees with you, and the psychological risk isn't the analysis, it's the patience the position demands while it's still unrecognized, since a real bargain and a value trap feel identical while you're holding either one.
A stock is considered undervalued when its price sits below a reasonable estimate of the underlying business's worth, based on earnings, assets, cash flow, or comparison to similar companies. The strategy is simple to state. The hard part is sitting through the stretch of time, sometimes a long one, where the market disagrees with you.
Worth checking before you act on it:
PnL App tracks the decisions you make around every position, not just the position itself, so the pattern shows up before it costs you.