NADH can donate electron to those electron carries with less negative charge compared to that NADH itself.
Electron is a stable subatomic particle with a charge of negative electricity, found in all atoms and acting as the primary carrier of electricity in solids. Electron called subatomic particle because it is the smallest particle that will build up an atom, and also electron has a negative value because it has a negative charge.
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Basically, NADH here able to donate electron to those electron that carries with less negative charge compared to that of NADH. NADH also will not able to donate electron to those with the same voltage as that NADH and higher negative voltage compared to its value.
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