forgot is a past tense of the verb 'forget.'. When used in this capacity, forgot denotes the action of neglecting or failing to remember something, either deliberately or not. In other contexts, the verb 'forgot' can also be used to signify the intentional abandonment of something after having prior knowledge of it.
She forgot all of the instructions she had been given.
He forgot his promise to his parents.
She forgot her duties as a teacher.
when using 'forgot' as a verb, it is important to remember that you are referring to the past tense.