2. Troubleshooting "Property 'map' does not exist on type 'Observable'" in Angular with TypeScript 1.8
   Property 'map' does not exist on type 'Observable<Response>': This error indicates that you're trying to use the map operator on an Observable<Response> object
3. Understanding Return Types in TypeScript: Function Definitions and Inferred Types
   Function Type Annotations: When you define a function, you can explicitly specify the return type along with the parameter types