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Guidance Needed: Implementing JWT Authentication in ASP.NET Core 5 REST API

I am working on developing a secure REST API using ASP.NET Core 5 and need to implement authentication using JSON Web Tokens (JWT). I am looking for a detailed, step-by-step guide to properly set up JWT authentication, including configuration, middleware, and best practices to ensure robust security.

Goals:

Successfully implement JWT authentication in my ASP.NET Core 5 REST API. PUBLIC SITE
Ensure secure and efficient handling of user authentication and authorization.
Gain a deeper understanding of JWT and its integration with ASP.NET Core.
Specific Areas of Assistance Needed:

Initial Setup:

How do I set up the basic structure of an ASP.NET Core 5 project for REST API development?
What are the essential NuGet packages required for JWT authentication?
JWT Configuration:

How do I configure JWT authentication in the Startup.cs file?
What settings should be included in the appsettings.json file for managing JWT tokens?
Token Generation:

How can I implement a service to generate JWT tokens upon successful user login?
What are the best practices for setting token expiration and claims?
Authentication Middleware:

How do I integrate JWT authentication middleware into the ASP.NET Core request pipeline?
What steps are necessary to protect specific endpoints and ensure they require authentication?
Authorization:

How can I implement role-based and policy-based authorization using JWT?
What are the best practices for managing user roles and permissions within the API?
Security Best Practices:

How can I secure my JWT tokens to prevent common vulnerabilities such as token theft or tampering?
What are the recommended practices for refreshing and invalidating tokens?
Testing and Validation:

How do I test the JWT authentication implementation to ensure it works correctly?
What tools or frameworks are recommended for automated testing of JWT-secured endpoints?
Context:

Current Setup: ASP.NET Core 5, Visual Studio 2019
Project Type: Secure REST API for a web application
Existing Code Base: New project setup, focusing on user authentication and data protection
Request for Assistance:
I would greatly appreciate detailed guidance, code snippets, or tutorials that can help me implement JWT authentication in my ASP.NET Core 5 REST API. Specific examples of configuring the Startup.cs, generating tokens, and securing endpoints would be extremely helpful.

Additional Information:

If needed, I can provide the current state of my project or specific sections of code for more targeted advice.
I am also open to recommendations on any additional tools or libraries that could enhance security or simplify the implementation process.
Thank you in advance for your assistance!

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