Having trouble putting real-world logic into the DDD domain layer

Question

Despite having studied Domain Driven Design for a long time now there are still some basics that I simply figure out.

It seems that every time I try to

Answer 1

Big part of you requests are related to object oriented design and responsibility assignment, you can think of GRASP Patterns and This, you can benefit from object oriented design books, recommend the following

Applying UML and Patterns