Clarification on Tutorial

[ang-jason]

Please provide us with the following information:

This issue is for a: (mark with an x)

- [ ] bug report -> please search issues before submitting
- [ ] feature request
- [X ] documentation issue or request
- [ ] regression (a behavior that used to work and stopped in a new release)

Quotated Question

The private AKS cluster is composed of a:

1. System node pool hosting only critical system pods and services. The worker nodes have node taint which prevents application pods from beings scheduled on this node pool.
2. User node pool hosting user workloads and artifacts.

Can I ask for the refine description on the above? Does application based images consider in the system node pool or user node pool? What are the advantages of having different pool of different subnets?

Thank you for any enlightenment!