What is the best way of presenting your reasons why they should give you the job or why they should hire you ?

You will not be required to just talk about your skills set that fit the job requirements because they also expect you to review  skills and experiences  your self-confidence and abilities. You can also be the answer to highlight your potential personal and explain why you are better than the rest of the applicants for the job option. Tell them about previous achievements in this area and prepared them mention your interest in the company and the job.