This gist showcases specific children element's children selection manipulation its further explained in the DOD article by Yasir Gaji

second-instance-2.js

let val; // initilizing alpha variable

const list = document.querySelector('ul.showcase'); // assigning sub variable "list" to the ul in the html collection

val = list.children[1].children[0]; // HERE WE ARE SELECTING THE FIRST CHILD OF THE SECOND CHILD IN THE "list" AND ASSIGNING IT TO "val"

val.style.color = 'red'; // here we manipulate and change "val"'s color