Beginners to intermediate professionals (product, data, engineering, no-code builders) who want a practical grasp of how modern apps talk to each other. What you’ll learn (outcomes) Explain what an API is and why REST is the default for web integrations. Read an API spec: base URL, endpoints, methods, params, headers, auth, status codes. Make real requests with Postman and Python (requests); interpret JSON responses. Understand HTTP status codes (200/201, 400/401/403/404, 429, 5xx) and safe retry patterns. Draft a simple API design and checklist for production readiness (auth, versioning, limits).