Introduction to basic Node.js usage without a server.

• Introduces Node.js for powering the backend of websites.
• Demonstrates running a JavaScript file using the Node.js environment.
• Explains creating a simple JavaScript function and running it through Node.js.

Understanding the global object in Node.js and its differences from the window object in browsers.

• Compares the global object in Node.js to the window object in browsers.
• Shows usage of Node.js global methods like setTimeout and setInterval.
• Highlights the absence of the window object and DOM methods in Node.js.

Exploring Node.js modules, importing and exporting between files.

• Explains how to split code into different files for modularity using require.
• Shows how to export and import data using module.exports.
• Introduces destructuring for importing multiple items from a module.

Using the file system core module in Node.js to interact with the file system.

• Describes the file system core module for reading, writing, creating, and deleting files and directories.
• Explains synchronous and asynchronous operations with the file system.
• Demonstrates checking for file/directory existence before performing operations.

Understanding streams for reading and writing large data in Node.js.

• Explains how streams allow handling of large files by processing chunks of data.
• Shows how to use read and write streams, and demonstrates using pipe for direct transfer.
• Discusses how streams are similar to real-world streams, providing data bit by bit.