It looks like you can use concealer differently depending on the shade.

Green/Mint/Olive: Evens out flushed or red skin.

Light purple/Lavender: Evens out yellow skin.

Yellow: Covers up blemishes like freckles, making the skin look more vibrant.

Orange: Effective for concealing dark circles, but more suitable for people with slightly darker skin tones.

Coral Pink/Peach Pink: Like orange, it is effective at concealing dark circles.

Other than: For dark beige color Shading It can be used for various purposes, and standard beige/vanilla shades can be used to cover blemishes. Pearl white can be used for highlighting or covering nasolabial folds to create a youthful look. Occasionally, there are reddish-brown correctors, but they are difficult for beginners to use.

Source: Namuwiki

I heard that it uses the skin's complementary colors to provide coverage; the more I learn about beauty tips, the more amazing they are.