The official NestJS documentation is arguably the best free fundamentals course available. It is meticulously maintained, up-to-date, and structured as a progressive tutorial. It includes:
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A strong fundamentals course is the only way to truly leverage these features. The official NestJS documentation is arguably the best
These are advanced fundamentals: middleware for logging, guards for authentication, and interceptors for transforming responses. guards for authentication
Services are used to encapsulate business logic and can be injected into controllers using the @Injectable() decorator.