List of usefull(atleast for me :) ) ASP.NET Core 3.0 samples: configuration Dosc about configuration logging middleware Docs about middleware Docs about writing custom middleware DI Docs about DI Action Filters Docs about Action filters Great post by ANdrew Lock about action filters Generic Host Docs about Generic Host Blazor Blazor Server Docs Blazor WebAssembly Docs Generally usefull links: Centralized exception handling To Do: Key Vault integration Third-Party DI container Health-checks