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Modern web development standards covering security, compatibility, and code quality patterns. \n \n Enforces HTTPS, Content Security Policy, and security headers to prevent XSS, clickjacking, and mixed-content vulnerabilities \n Addresses browser compatibility through proper doctype, charset, viewport configuration, and feature detection instead of user-agent sniffing \n Covers deprecated APIs (document.write, synchronous XHR, Application Cache) with modern replacements (dynamic script loading,

28 ClickHouse best practices rules organized by schema design, query optimization, and data ingestion strategy. \n \n Covers three critical areas: primary key and data type selection (immutable design decisions), JOIN and query optimization, and insert batching with mutation avoidance \n Includes 28 rules prioritized by impact, with schema design and query optimization rules marked CRITICAL due to ClickHouse's columnar storage and sparse index mechanics \n Provides structured review procedures f

Comprehensive guidance for building deliverable, compliant, and user-friendly email systems. \n \n Covers authentication setup (SPF/DKIM/DMARC), spam troubleshooting, and deliverability best practices to prevent emails from landing in spam \n Includes templates and patterns for transactional emails (password resets, OTPs, confirmations) and marketing emails with proper consent workflows \n Provides compliance frameworks for CAN-SPAM, GDPR, and CASL regulations, plus double opt-in and suppression