How Bot works

-- https://docs.microsoft.com/en-us/azure/bot-service/bot-builder-basics?view=azure-bot-service-4.0&tabs=cs

one by one
work flow
-- https://docs.microsoft.com/en-us/azure/bot-service/bot-builder-basics?view=azure-bot-service-4.0&tabs=cs

connector
-- https://docs.microsoft.com/en-us/azure/bot-service/dotnet/bot-builder-dotnet-concepts?view=azure-bot-service-3.0#connector

-- api service
https://docs.microsoft.com/en-us/azure/bot-service/rest-api/bot-framework-rest-connector-api-reference?view=azure-bot-service-4.0

-- activity
https://docs.microsoft.com/en-us/azure/bot-service/dotnet/bot-builder-dotnet-activities?view=azure-bot-service-3.0

source code
-- https://docs.microsoft.com/en-us/dotnet/api/microsoft.bot.builder?view=botbuilder-dotnet-stable