Greetings!

Human resources are the people that work in a company or an organization, so the HR department of the company is responsible for managing all the people employed in that company. So, a course in HR management will focus on how to manage and get the best out of the human resource of any company. 

Marketing and retail refer to how well you can sell a product. If you have amazing communication skills along with convincing powers, then this course is for you. 

Hope this helps. All the best!