Start WordPress plugin development with a separate test installation, an editor, browser developer tools and version control. The aim is to make changes you can inspect, test and undo without experimenting on a live publishing site.
A development WordPress installation
The official @wordpress/env documentation describes an environment for developing and testing WordPress projects. Review its prerequisites before installing it. A staging environment provided by your host is another option when you need to reproduce the production PHP and database setup.
Use test content and accounts. Record the WordPress and PHP versions you support, and verify the plugin against those versions rather than assuming the version on your laptop represents every installation.
An editor and version control
Choose an editor that makes PHP, JavaScript, CSS and HTML easy to read. Save changes in version control in small, understandable steps. Keep credentials, database exports and private user data out of the repository.
Browser tools and error logs
Use the developer tools built into your browser to inspect HTML, styles, JavaScript errors and network requests. Check the request that failed before changing unrelated code. For server-side errors, use WordPress's debugging guidance and keep diagnostic output away from public visitors.
The plugin and hook references
The Plugin Handbook explains the plugin structure. Our hooks guide points to actions, filters and their references. Read the documented parameters and request context before attaching a callback.
A repeatable test and release process
Test activation, the intended feature, deactivation and relevant permission boundaries. Check a normal user and a logged-out visitor as well as an administrator. Keep a backup and an explicit way to return to the previous plugin version. For remote file transfer, use an encrypted method supported by the host, such as SFTP or SSH, rather than putting credentials into an unencrypted connection.
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