how to pass value from one component to another in angular 6 code example

Example: share data between components angular

import { Component, Input } from '@angular/core';
//Child-Component
@Component({
  selector: 'app-child',
  template: `
      Say {{ message }}
  `,
  styleUrls: ['./child.component.css']
})
export class ChildComponent {

  @Input() childMessage: string;

  constructor() { }

}
======================================================================
import { Component } from '@angular/core'; 
//Parent-Component data transfer to Child-Component
@Component({
  selector: 'app-parent',
  template: `
    <app-child [childMessage]="parentMessage"></app-child>
  `,
  styleUrls: ['./parent.component.css']
})
export class ParentComponent{
  parentMessage = "message from parent"
  constructor() { }
}