Protect wp-cron.php From Outside Requests
Requires a secret key for requests to wp-cron.php and adds that key automatically to WordPress's own cron calls, so outsiders cannot hammer the endpoint to slow your site down.
Snippet Library
Security snippets for WordPress
Snippets that harden WordPress: turn off XML-RPC, hide the version number, stop user enumeration, add security headers and block risky uploads. Small, reviewable changes for site owners who want fewer attack points without a heavy security plugin.