APIs you won't hate
Unknown
Free resources, podcast, and best practices by Phil Sturgeon.
More resources on API Design
Swagger
API design and documentation tool, free editor.
OpenAPI Specification
Standard for API descriptions, free tools and docs.
REST API concepts and examples
Comprehensive REST API tutorial recommended in r/learnprogramming.
apiacademy.co
APIAcademy.co is a learning resource focused on API design, strategy, and governance, offering articles, tutorials, guides, and courses to help teams design robust, scalable APIs.
swagger.io
Swagger.io is the official hub for Swagger/OpenAPI tooling to design, build, document, and consume RESTful APIs. It offers tools such as Swagger Editor, Swagger UI, and SwaggerHub, plus tutorials, guides, and references for API design, mocking, and code generation.
martinfowler.com
Martin Fowler's website is a premier resource for software design and architecture content, featuring extensive articles, essays, and case studies on topics like refactoring, design patterns, agile methods, and microservices. It also provides links to his books, talks, and practical tooling and guidance for software practitioners.