Which areas within NestJS do you need to study or deepen your knowledge?

In NestJS, the following areas should be studied in depth:

• Decorators and metadata — understanding how decorators work and how they affect class and method behavior.
• Dependency Injection — mechanisms for injecting services and managing component lifecycle.
• Modules and application organization — proper separation of application into modules for scalability.
• Middleware, Guards, Interceptors, and Pipes — extending request functionality, validation, authorization, and data transformation.
• Working with asynchronous data streams and RxJS.
• Testing NestJS components — writing unit and e2e tests.
• Integration with databases via TypeORM or Prisma — configuring and optimizing queries. Deep understanding of these areas will enable effective use of NestJS features and creation of scalable applications.