This is a question regarding care after resin treatment.

I have a few teeth that were filled with resin after cavity treatment, and it seems like the color is changing over time.
I am wondering if resin is a material that naturally takes color well.
I would also like to know if drinking coffee or tea frequently causes discoloration to happen faster.
I am also curious about how long resin usually lasts.
I would like to know what kind of care is needed to maintain it for a long time without retreatment.
I am also wondering if I need to replace it regularly, even if there is no pain.