The meaning of land use vector map

Hello everyone, I encountered some problems when learning the water production module. I hope you can give me some opinions.
What is the meaning of color block numbers when opening the land use map in GIS software? I found the representative meaning of GIS land use type on the Internet, but it is not consistent with my actual map. Is it because the representative meaning is changing at any time? I’d like to ask your opinions, thank you.

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Hi @summon , you will need to look for information from the provider of your data. There are no standard numbers and categories for landuse maps. Every dataset can be different. Whoever is providing the data should also provide the key that describes what each number means.