Setting up a Node.js project:

• Create a new project: npm init
• Install dependencies: npm install
• Create an entry point file (e.g., index.js)

Working with modules:

• Importing modules: const moduleName = require('module')
• Exporting from a module: module.exports = exportedObject

Working with the file system:

• Reading a file: fs.readFile(path, encoding, callback)
• Writing to a file: fs.writeFile(path, data, callback)
• Checking if a file/directory exists: fs.existsSync(path)

HTTP server and requests:

• Creating an HTTP server: http.createServer(callback)
• Handling requests and responses: request and response objects in the server callback
• Making HTTP requests (external): http.get(url, callback) or https.get(url, callback)

Working with the command line:

• Accessing command-line arguments: process.argv
• Exiting a Node.js program: process.exit()

Working with packages and dependencies:

• Installing a package locally: npm install
• Installing a package globally: npm install -g
• Uninstalling a package: npm uninstall

Asynchronous programming:

• Using callbacks: function callback(err, result) { ... }
• Using Promises: new Promise((resolve, reject) => { ... })
• Using async/await: async function functionName() { ... }

Debugging and logging:

• Printing to the console: console.log('message')
• Debugging with breakpoints: debugger statement
• Using a debugger: node inspect or node --inspect

Package.json scripts:

• Defining custom scripts: "scripts": { "start": "node index.js" }
• Running scripts: npm run

NPM commands:

• Installing all dependencies: npm install
• Updating packages: npm update or npm update
• Listing installed packages: npm list
• Searching for packages: npm search