Here are some examples:
* Le pied d'une montagne: The foot of a mountain
* Le pied d'un lit: The foot of a bed
* J'ai mal au pied: My foot hurts
* Mettre un pied devant l'autre: To put one foot in front of the other (to walk)
It's important to note that "pied" can also be part of compound words, like "pied-à-terre" which means a small apartment or pied-à-terre, or "pied de biche" which means crowbar.