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+# What is JavaScript Modules?
+JavaScript modules let us organize code into separate files, making the code easier to manage and reuse. We can export parts of one file (like functions or variables) and import them into another to keep our code clean and modular.
+
+## Different Module Systems
+
+JavaScript has two main ways to handle modules:
+
+- **CommonJS** is the older format used mostly in Node.js. It uses `require` and `module.exports`.
+
+- **ES Modules** (ESM) are the modern, standard way for browsers and Node.js. They use `import` and `export`.
+
+They are **not** fully compatible. At CYF, you should use ESM, not CommonJS.
+
+## Where can I learn ESM?
+- [Modules, introduction](https://javascript.info/modules-intro)
+- [JavaScript modules -- JavaScript | MDN](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Modules)
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diff --git a/Sprint-3/todo-list/01-using_esm_with_nodejs_and_jest.md b/Sprint-3/todo-list/01-using_esm_with_nodejs_and_jest.md
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+# Using ESM with Node.js, Jest, and `jsdom`
+
+## Node.js
+
+Node.js supports both CommonJS and ESM, with CommonJS being the default module system.
+
+To use ESM, we can add `"type": "module"` to `package.json`, or we can name the JavaScript files
+with `.mjs` file extension.
+
+**Important**:
+- Avoid mixing CommonJS and ESM in the same project. At CYF you should only use ESM.
+
+
+## Jest
+
+[Jest’s support for ESM](https://jestjs.io/docs/ecmascript-modules) is still experimental, and may require additional configuration to work correctly.
+
+One way to execute Jest test script that uses ESM is to
+
+1. **Update the custom `test` script in `package.json`**:
+```javascript
+"scripts": {
+ "test": "NODE_OPTIONS=--experimental-vm-modules jest"
+}
+```
+
+**Note**: On Windows, use **`set`** instead
+```javascript
+"scripts": {
+ "test": "set NODE_OPTIONS=--experimental-vm-modules && jest"
+}
+```
+
+
+2. **Run a specific Jest test script using**:
+
+```
+npm test --
+```
+
+**Note**: The `--` is optional if you do not have arguments to be forwarded to the underlying
+`jest` command.
+
+
+## `jsdom`
+
+[**`jsdom`**](https://github.com/jsdom/jsdom), a pure-JavaScript implementation of DOM for
+use with Node.js, **does not yet support** `
-
+