Enable WP_DEBUG in wp-config.php to catch errors during development. Use error_log() to write debug information to your debug.log file. Implement logging at key points in your plugin’s execution. WordPress provides do_action(‘wp_footer’) for outputting debug information on pages. Use var_dump() and print_r() wrapped in pre tags for readable output. Consider installing Query Monitor plugin for detailed performance insights. Never leave debugging enabled on production sites. Create a separate development environment that mirrors production for accurate testing. Proper debugging saves time and prevents bugs from reaching users.