I want to know the routine for managing freckles.

As I get older, I'd like to develop a systematic skincare routine, but I'm wondering what ingredients I should use in my morning and evening cosmetics to be effective.
I've heard that a routine for managing freckles using vitamin C or retinol is more effective than simply applying a whitening cream. Is there a safe way to start a freckle management routine without side effects?
I'd appreciate it if you could share your know-how on managing freckles, including lifestyle habits that can work synergistically with the basic products you're currently using. I'd appreciate your expert advice.