Summary
.NET Core added many features, such as configuration and logging, that are now part of .NET. The new APIs are better and provide more value than the old .NET Framework ones. Most of the boilerplate code is gone, and almost everything is on an opt-in basis.
Options allows us to load and compose configurations from multiple sources while using those easily in our systems through simple C# objects. It removes the hassle of the previous configuration from web.config and makes it easy to use. No more complex boilerplate code is needed to create custom web.config sections; just add a JSON object to appsettings.json, tell the system what section to load, what the type should be, and voilà — you have your strongly typed options! The same simplicity applies to consuming settings: inject the desired interface or the class itself and use it. With that, you are up and running; no more static ConfigurationManager or other structures that are hard to test.
Logging is...
