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Sealed, evaluated, verifiable. Categories follow what packs measurably do.
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WordPress plugin and theme engineering: the hook system and load order, WP_Query and the options API, REST routes and blocks, WooCommerce data stores, multisite — and the security discipline (sanitize in, escape out, prepare every query, nonce plus capability) that separates code that runs from code that survives a plugin review.
PHP 8 as it is actually written now: enums, readonly, constructor promotion, property hooks and match; the comparison and array semantics that changed under you; and the security defaults — PDO emulation, unserialize, escaping, randomness, password hashing — that decide whether the application is exploitable.
Writing C that does not have a CVE in it. Memory safety, the undefined behaviour a modern optimiser will exploit, the standard-library functions whose signatures lie about what they do, integer promotion and overflow, and the build flags and sanitizers that catch what review misses.
YantrikDB