How do I know which color is for what?

[somber viper]

just google it.
type on google
#f1f8f4 color

[dire horizon]

https://github.com/mantinedev/mantine/blob/master/packages/%40mantine/core/src/core/MantineProvider/MantineCssVariables/default-css-variables-resolver.ts

[nocturne topaz]

iv mean the purpose for each colour in the list, not which color = what