Topic
Fixes for the errors that take a WordPress site down.
Troubleshooting
Remove the temporary .maintenance file only after confirming the update process has stopped, then complete or roll back the interrupted update and verify the site.
Troubleshooting
Check whether the database server is available, verify wp-config.php credentials, test the connection and repair tables only when corruption is actually reported.
Troubleshooting
A WordPress 500 error is a server-side failure. Find its log entry first, then test plugins, the active theme, rewrite rules, PHP limits and core files in a safe order.
Troubleshooting
Recover a blank WordPress site by checking Recovery Mode and error logs first, then isolating plugins, the active theme, memory exhaustion and damaged core files.