Comprehensive error handling patterns across Python, TypeScript, Rust, and Go with language-specific implementations.

• Covers error philosophies (exceptions vs Result types), error categories (recoverable vs unrecoverable), and language-specific patterns including custom exception hierarchies, Result types, and async error handling
• Includes three universal patterns: circuit breaker for preventing cascading failures, error aggregation for collecting multiple errors, and graceful degradation with fallback functions
• Provides best practices for fail-fast validation, meaningful error messages, resource cleanup, and type-safe error handling with concrete code examples
• Highlights common pitfalls like overly broad exception catching, empty catch blocks, poor error messages, and unhandled async errors