This book is a complete guide to building modern, reliable, and production-ready APIs with ASP.NET Core Minimal APIs. It takes you from first principles to advanced implementation patterns used in professional backend development. You learn how to design endpoints, structure data flow, apply validation, implement security, manage performance, and prepare applications for real-world deployment. Each chapter explains concepts in direct, practical language. All examples use clear code samples and well-defined steps so you move from reading to building without friction. You see how to use dependency injection, token based identity, role based access, routing rules, filters, error handling pipelines, EF Core data access, and performance profiling. You also learn how to test your services with unit tests, integration tests, and contract testing practices. The book prepares you for long-term maintenance by showing stable response contracts, versioning strategies, logging practices, metrics, and distributed tracing. This is a complete guide for developers who want strong fundamentals and consistent delivery standards across development, testing, and deployment. The content fits beginners entering web API development and experienced developers adopting Minimal APIs for faster and cleaner service design. What You Will Learn • Minimal API structure and endpoint mapping • Route patterns, model binding, and input processing • Token based identity, role checks, and protected endpoints • Centralized error handling and logging practices • EF Core setup, entity mapping, and repository patterns • Query operations, validation flows, and filter usage • Testing with unit tests, integration tests, and mocks • Metrics, tracing, performance checks, and profiling • Docker packaging, CI workflow design, and cloud deployment steps • Post deployment verification and environment based behavior Who This Book Is For • You building API services with ASP.NET Core • You deploying microservices that require fast startup, stable performance, and predictable responses • You learning clean architectural practices for long-term maintenance • You improving testing, logging, and observability in your services This book gives you a structured, practical path for mastering Minimal APIs and building dependable backend services ready for production.