This is the 6th most frequent Persian word.
کرد
"کرد" (kard): "Did" or "performed" (past tense of "to do" in Persian).
In this sentence, "کرد" is the past tense of the verb "کردن" and is used to indicate that the subject performed a complete action (completed).
او تمرینات خود را کامل کرد.
He completed his exercises.
"کرد" in this context conveys the action of putting a previous decision into practice (implemented).
او تصمیم خود را عملی کرد.
She implemented her decision.
Here, "کرد" signifies the past action of starting a conversation (talked), highlighting social interaction or communication.