Database samples
Chinook is a good name choice for a database that intents to be an alternative to Northwind
Sample database for SQL Server, Oracle, MySQL, PostgreSQL, SQLite, DB2
See also Chinook Database Schema
https://archive.codeplex.com/?p=chinookdatabase
Code Samples
https://github.com/jorgecotillo/aspnet_core_identity_server_4_postman
Web API in ASP.NET Core with IdentityServer4
An In Depth Guide Into a Ridiculously Simple API Using .NET Core
Your Guide to RESTful APIs with ASP.NET Core
https://stackify.com/asp-net-core-web-api-guide/
Creating Web API With ASP.NET Core Using Visual Studio Code
http://www.c-sharpcorner.com/article/creating-web-api-with-asp-net-core-using-visual-studio-code/
Five RESTFul Web Design Patterns Implemented in ASP.NET Core 2.0 Part 1: Content Negotiation
https://blog.jeremylikness.com/5-rest-api-designs-in-dot-net-core-1-29a8527e999c
Five RESTFul Web Design Patterns Implemented in ASP.NET Core 2.0 Part 2: HATEOAS
https://blog.jeremylikness.com/5-rest-api-designs-in-dot-net-core-2-ad2f204c2d11
Five RESTFul Web Design Patterns Implemented in ASP.NET Core 2.0 Part 3: Exceptions
https://blog.jeremylikness.com/5-rest-api-designs-in-dot-net-core-3-91ebff38393d
Five RESTFul Web Design Patterns Implemented in ASP.NET Core 2.0 Part 4: Optimistic Concurrency
https://blog.jeremylikness.com/5-rest-api-designs-in-dot-net-core-4-8ac863e961e4
Five RESTFul Web Design Patterns Implemented in ASP.NET Core 2.0 Part 5: Security
https://blog.jeremylikness.com/5-rest-api-designs-in-dot-net-core-5-3ee2cf16713e
Enabling authentication using Facebook, Google, and other external providers
https://docs.microsoft.com/en-us/aspnet/core/security/authentication/social/
Five RESTFul Web Design Patterns Implemented in ASP.NET Core 2.0 Bonus: Swagger
https://blog.jeremylikness.com/5-rest-api-designs-in-dot-net-core-6-9e87cf562241
Bonus: Swashbuckle.AspNetCore
Source: https://github.com/FabianGosebrink/ASPNETCore-WebAPI-Sample