Extreme TLDR:
– Learn WordPress file structure (wp-admin, wp-content, wp-includes).
– Understand wp-config.php and .htaccess files.
– Use safe file access methods, manage permissions, and enhance security.
– Master customization for development within existing architecture.
– Follow security best practices; consider managed hosting for ease.
https://www.advancedcustomfields.com/blog/wordpress-file-structure/