What difficulties have you faced when developing a project on ASP.NET Core from scratch?

When developing a project on ASP.NET Core from scratch, the following difficulties are often encountered:

• Setting up infrastructure and dependencies. Properly configuring the DI container, middleware, routing, and services.
• Understanding the request lifecycle. It is important to understand how HTTP requests are processed to correctly inject logic.
• Working with Entity Framework Core. Setting up migrations, optimizing queries, and managing the data context can cause difficulties.
• Authentication and authorization. Configuring Identity, JWT, or other security schemes requires attention.
• Error handling and logging. Properly organizing global error handling and logging system.

For example, when implementing dependency injection, it is important to understand how to register services with different lifetimes:

services.AddTransient<IMyService, MyService>(); // new instance each request
services.AddScoped<IMyService, MyService>();    // one instance per request
services.AddSingleton<IMyService, MyService>(); // one instance for the entire application