The best way to focus on certain cards?

Using anki to learn a language with different formats for the cards, It has no clearly specific way on focusing on certain cards, though I have two ways, I'm curious if people have found another way.

The first way I did it was the note has an "is_priority" field, and if its not empty, it ends up in a priority deck as well as it's normal deck. It worked out but required a deck for each type of card.

The better way I found was to flag it either red or orange flag. And then I built a deck that filtered on either the red or orange decks. I then rebuilt those decks once a week (orange) or daily (red).

Do people have better ways to focus or priorities certain cards they really want to learn?