If you get this type of following errors :

Can't bind to 'ngModel' since it isn't a known property of 'input' ” 

You just import the FormsModule in your's module file and also add the reference in imports array so that you can not get this type of error again

import { NgModule } from '@angular/core';

import { FormsModule } from '@angular/forms';

import { AppComponent } from './app.component';

import { SimpleComponent } from './simple/simple.component';

@NgModule({

declarations: [

AppComponent,

SimpleComponent

],

imports: [

BrowserModule,

FormsModule

],

providers: [],

bootstrap: [AppComponent]

})