Challenge 1: Connect and Insert — Possible Solution
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const { MongoClient } = require("mongodb");

const client = new MongoClient("mongodb://localhost:27017");
await client.connect();

const db = client.db("library");
const books = db.collection("books");

await books.insertOne({ title: "Deep Learning Foundations", author: "Jane Smith" });

WHY THIS WORKS AS AN ANSWER
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This follows the exact sequence the chapter's own example demonstrated:
create a MongoClient with the local connection string, await connect()
before doing anything else (the connection must be established first),
then select the specific database with client.db("library") — this
mirrors the mongosh "use library" command from Chapter 2, just
expressed as a method call in code rather than a shell command — and
finally call insertOne() on the books collection, the same driver
method whose mongosh equivalent was covered back in Chapter 3.