Configure ServicePointManager.SecurityProtocol through AppSettings
Usually .NET automatically finds a security protocol in common, but sometimes you have to update ServicePointManager.SecurityProtocol explicitly.
Real-time applications with Blazor Server and Firestore
Blazor Server is built on SignalR, which is built on websockets. Among things, websockets enable Blazor Server to push changes from the server to the browser at any time. You can build real-time UI's when you combine this with a real-time database.
Pushing UI changes from Blazor Server to browser on server raised events
Blazor Server is built on SignalR, and SignalR is built on websockets among other techniques. The combination of these technologies allow Blazor Server to push UI changes into the client without the client requesting those changes.
Changing Serilog Minimum level without application restart on .NET Framework and Core
There are many ways to configure Serilog. The configuration library has the additional advantage that it supports dynamic reloading of the MinimumLevel and LevelSwitches.
Using ConfigurationProviders from Microsoft.Extensions.Configuration on .NET Framework
.NET Core introduced new API's. Some of those libraries are built to support multiple .NET platforms including .NET Framework. So, if you're still using .NET Framework, you could also take advantage of these new libraries.