If it turns out that later down the line I realize that "every card should have that size and color for the card title", then I'll pull it out to a separate class or part of a partial or something like that.

The idea being at that point then I have more context around when and how that particular section of a component should be displayed, so I have more context about what I should name the class (i.e. "card-subtitle").

I feel like the documentation explains it fairly well if you're interested in reading more about it:

https://tailwindcss.com/docs/extracting-components#extractin...