How-To Guides

Make a navigation bar that sticks to the top of the page when scrolling.

Center a div element horizontally and/or vertically using modern CSS.

Add smooth hover animations to cards with CSS transitions.

Style a button with a beautiful gradient background and smooth hover states.

Implement a dark/light mode toggle using CSS custom properties and a checkbox.

Use the Fetch API to make HTTP requests and handle responses.

Save and retrieve data in the browser using localStorage.

Limit how often a function fires using debounce — perfect for search inputs and resize events.

Programmatically copy text to the clipboard using the modern Clipboard API.

Sort arrays of objects by string, number, or date properties.

Format dates using Intl.DateTimeFormat and the Date object.

Build an accessible modal popup using the HTML <dialog> element.

Build a responsive photo gallery using CSS Grid without any JavaScript.

Create a navigation bar that collapses to a hamburger menu on mobile.

Sanitize and validate form input in PHP to prevent XSS and SQL injection.

Connect to a MySQL database using PHP PDO with prepared statements.

Send emails in PHP using mail() or PHPMailer with SMTP.

Open, read, write, and append to files using Python built-in functions.

Write concise, readable list transformations using Python list comprehensions.