1. Create a new file. The first step is to create a new file in your WordPress wp-content/themes/your-theme/functions.php file. Inside this file, you will need to create a new PHP function. The name of this function can be anything you want, but it is a good idea to use a descriptive name that reflects the purpose of your shortcode or as you wish.
2. Define the shortcode. The next step is to define the shortcode. This is done by using the add_shortcode() function. The add_shortcode() function takes two arguments: the name of the shortcode and the function that will be executed when the shortcode is used.
3. Write the shortcode function. The shortcode function is the code that will be executed when the shortcode is used. This code can be anything you want, but it is a good idea to keep it simple.
4. Save the file. Once you have defined the shortcode and written the shortcode function, you need to save the file.
5. Use the shortcode. Once you have saved the file, you can use the shortcode in your WordPress posts and pages. To do this, simply add the shortcode to your content.


function my_shortcode($atts) {
// This is the code that will be executed when the shortcode is used.
return 'This is my custom shortcode!';
}

add_shortcode(‘my_shortcode’, ‘my_shortcode’);

To use this shortcode, you would simply add the following code to your WordPress post or page:

[my_shortcode]

Do as directed and finally you are good to go.