In the first, you make assertions about your abilities, qualities and achievements. You write powerful, but honest, statements that make the reader immediately perk up and realise that you are someone special.

The second section, the evidence section, is where you back up your assertions with evidence that you actually did what you said you did. This is where you list and describe the jobs you have held, your education and anything else that is relevant. This is all the stuff you are obliged to include.

Most resumes are just the evidence section, with no assertions.

The juice is in the first, assertions section. When a prospective employer finishes reading your resume, you want them to immediately reach for the phone to invite you in to interview. You don't want them informed. You want them interested and excited.