add a list item in js through DOM code example

Example 1: appendchild javascript

const parent = document.createElement('div');
const child = document.createElement('p');
const childTwo = document.createElement('p');
parent.append(child, childTwo, 'Hello world'); // Works fine
parent.appendChild(child, childTwo, 'Hello world');
// Works fine, but adds the first element and ignores the rest

Example 2: appendchild javascript

const parent = document.createElement('div');
const child = document.createElement('p');
const appendValue = parent.append(child);
console.log(appendValue) // undefined
const appendChildValue = parent.appendChild(child);
console.log(appendChildValue) // <p><p>