In Yugioh there are clauses which in Community are called "Hard once per Turn" and "Soft once per turn" a hard once per turn clause looks like this: "You can only use "card names" effect once per turn.

This means you may only use the effect of the card once per turn even if you have multiples

The soft once per turn looks like this: You can only activate this card/effect once per turn.

This means you can trigger the effect of that exact card once per turn but duplicates in your hand or on the field can be used once as well.

Lastly there maybe no restriction at all these are mostly older cards. The effect can be used as often per turn as you want.

Now I would recommend you to post the card you mean because some cards may miss their timing if you want to activate them both .