Greetings. I went through the documentation starting with following URL: https://docs.microsoft.com/en-us/dynamics365/marketing/help-hub#extend-the-system and I realized that even the "Advanced Tutorials" section gives a high level description/reference of the features. If there is a more detailed and lower level documentation available, could you please add a link to the page mentioned above or let us know how we could access it. Any reference to books or videos giving the same type of technical documentation would also be welcomed. Thank you and best regards, -Frank