The video begins by revisiting the use of the require function and introduces the correct way to create and reuse code using module.exports in Node.js.

• In the previous video, viewers learned about loading a module with the require function.
• The proper method to create and reuse code is by exporting functionality with module.exports.
• Module.exports is always available in Node.js and is what the require function returns for a module.

The video demonstrates how to export a function from a module by assigning it to the module.exports object.

• Instead of executing code within a module, the add function is exported from the module by assigning it to module.exports.
• The value of module.exports is what is returned by the require function for that module.

The video explains how to import the exported function in another file and demonstrates its reusability.

• The exported add function is stored in a constant and called multiple times, showing its reusability.
• Running the code with Node.js prints the output of the add function to the console.
• The example illustrates that the constant name used to capture the exported value can be arbitrary.

The video highlights that the naming of the imported module's constant is independent of the exported value's name.

• The constant capturing the value of module.exports can be named differently, demonstrating a default export.
• Changing the name of the constant to which the module is imported does not affect the result.

The video concludes with a summary of modules in Node.js and teases more advanced concepts to be discussed in upcoming videos.

• The video summarizes the CommonJS format for exporting and importing in Node.js, which facilitates code reusability.
• The video promises to cover additional concepts about modules for a deeper understanding in future instalments.