Install Redux Dev tools :

Install chrome extension. Go to ngrx websites => view => ngrx/store-devtools => install @ngrx/store-devtools => check package.json main.ts => provideStoreDevtools and its declarations

also provide providerStore

Reducers : Wt's reducer?
This is just a function where inside we are defining how actions are changing our state.

TO reduce boiler plate we user creatFeature

So create store/reducers.ts