Help me in solving LINK01P02 problem

help
,
1

My issue

explain code step by step

My code

class Node {
    constructor(val) {
        this.value = val;
        this.next = null;
    }
}

class LinkedList {
    constructor() {
        this.head = null;
    }

    insertFront(value) {
        console.log("Inserting " + value);

        // Step 1: Create a new Node
        const newNode = new Node(value);

        // Step 2: Set next of newNode to the current head
        newNode.next = this.head;

        // Step 3: Set newNode as the head
        this.head = newNode;
    }

    getHeadValue() {
        if (this.head === null) {
            return -1;
        } else {
            return this.head.value;
        }
    }
}

(function() {
    const list = new LinkedList();
    list.insertFront(3);
    console.log("The value at the head is: " + list.getHeadValue());

    list.insertFront(2);
    console.log("The value at the head is: " + list.getHeadValue());
})();

Learning course: Design and analysis of Algorithms
Problem Link: https://www.codechef.com/learn/course/abesit-daa/ABESITDA01/problems/LINK01P02