Explore core concepts of Domain Driven Design, its pros and cons, modeling techniques, and hexagonal architecture to transform complex business requirements into effective software solutions.

In this course, you are going to learn the most important concepts of Domain Driven Design or DDD for short. You will see both benefits and drawbacks, techniques to model, how DDD can be implemented using hexagonal architecture and many other amazing concepts.

By the end of this course, you will be able to take complex business requirements and processes and turn them into meaningful software.

Domain Driven Design Made Easy

To comprehend how software may be implemented, based on hexagonal architecture, let us review an example related to the processes that occur in a restaurant.

# Example definition
This restaurant wants to allow a customer to order something through its website. The website consumes **REST APIs** to execute the business logic. Therefore, we have to implement a microservice that exposes the functionality to create an order. This use case displays the following restrictions:
* If a customer has no previously created orders, it is possible to create a new order.
* If a customer has already created an order, it is not possible to create a new order.


In the upcoming lessons, each layer of this microservice will be implemented in order to accomplish the business need.

## Model definition
The following diagram depicts the domain layer and how the domain objects should be implemented to fulfill the business rules.


Learn more about the domain layer, through the implementation of an example.

Introduction

Mapping Domain to Model

Domain Activities

Domain Objects

Domain Abstractions

Hexagonal Architecture

Conclusion

Domain Layer

Example definition