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WP_DEBUG shows the real PHP errors behind a broken WordPress site. Learn how to enable debug mode safely, log errors to debug.log without displaying them, keep the log private, and when to use SCRIPT_DEBUG, environment types and Query Monitor.

WordPress upload limits come from PHP, your web server and your CDN, not WordPress itself. Learn how to raise upload_max_filesize and post_max_size, fix 413 Request Entity Too Large errors, and adjust the multisite upload limit.

"Allowed memory size exhausted" means a WordPress request hit its PHP memory limit. Learn the difference between WP_MEMORY_LIMIT, WP_MAX_MEMORY_LIMIT and PHP memory_limit, how to raise each one, and how to find the plugin or task using the memory.

"Error establishing a database connection" means WordPress cannot reach its database. Learn how to check the wp-config.php credentials, DB_HOST and user privileges, repair corrupted tables, and spot server-side problems your host must fix.

ERR_TOO_MANY_REDIRECTS means two layers of your WordPress setup keep redirecting visitors back and forth. Learn how to trace the loop and fix Cloudflare SSL mode, proxy HTTPS detection, site URLs and duplicate redirect rules.