How to reload or refresh only child component in Angular 8

Best way to update a child component is: ngOnChanges()

ngOnChanges(): “A lifecycle hook that is called when any data-bound property of a directive changes. Define an ngOnChanges() method to handle the changes.” We use this lifecycle hook to respond to changes to our @Input() variables.

Example:

import { Component, Input, OnChanges } from "@angular/core";

@Component({
  selector: "child-component",
  templateUrl: "./child-component.html"
})
export class MyComponent implements OnChanges {
  @Input() someInput: string;

  constructor() {}

  ngOnChanges() {
  /**********THIS FUNCTION WILL TRIGGER WHEN PARENT COMPONENT UPDATES 'someInput'**************/
  //Write your code here
   console.log(this.someInput);
  }   
 
}

Use child component inside parent component as follows

<child-component [someInput]="inputValue"></child-component>