ModX Revo - why do we need "resource groups"?

Question

MODX

I recently started looking into this system.
I just can't figure out why we need: content -> resource groups.
when creating a resource, there is a "resource group" tab, I add this resource to the created group and I don't see any special changes.

Answer 1

For example, to control access to resources, see here - bayguzin.ru/main/uroki/uroki-modx-revolution/resou...

Answer 2

Here you can also see https://itchief.ru/lessons/modx-revo/modx-setting-...