.Net core MS VS and SwagggerHub

Hi, 

What is the best practice to design API in SwaggerHub provided that the implementation is .Net Core 5 and c# 9?

Please, advise reference as the developer are new to swaggerHub? What is the difference between https://marketplace.visualstudio.com/items?itemName=SmartBearSoftware.vscode-swaggerhub  and https://docs.microsoft.com/en-us/samples/aspnet/aspnetcore.docs/getstarted-swashbuckle-aspnetcore/