Final answer:
The phrase 'por cierto' in Spanish means 'by certain' or 'for sure' and is used to express certainty or agreement.
Step-by-step explanation:
The phrase "por cierto" in Spanish means "by certain" or "for sure". It is used to express certainty, agreement, or to add information to a conversation. For example, if someone says, "El examen estuvo difícil, ¿no?"(The exam was difficult, wasn't it?), you can respond with "Por cierto, pero creo que lo hice bien" (For sure, but I think I did well). It is a useful expression to enhance your conversational skills in Spanish.
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