NgRx Explained Simply (When You Really Need It)

NgRx is a state management framework inspired by Redux.

It introduces a consistent pattern:
- Actions describe events
- Reducers compute next state
- Selectors read state
- Effects handle async side work (API calls)

## Why teams adopt NgRx

- strict structure for large apps
- great dev tools (time travel debugging)
- predictable flow, easier long-term maintenance

## When NgRx is overkill

- small apps
- few screens
- minimal shared state
- fast-moving MVP stage

## NgRx flow picture

```mermaid
flowchart LR
  UI[Component] --> A[Action]
  A --> R[Reducer]
  R --> S[Store State]
  S --> UI
  A --> E[Effect]
  E --> API[Backend API]
  API --> E
  E --> A2[Success/Fail Action]
  A2 --> R
```

> Next: Advanced performance, OnPush and immutability patterns.