login and registration in angular 8 code example

Example 1: make service in angular 8

For Creating Service you have type command like below
ng generate service service-name
or
ng g s service-name

And if you want to make service into folder
ng generate service /folder-name/service-name
or
ng g s /folder-name/service-name

Example 2: how to create app.routing.module.ts in angular 6

ng generate module app-routing --flat --module=app