Your resume is a marketing document and should be focused on delivering a specific message about you to your target audience. In order to know what to include in your resume, you have to be able to answer the following question:
What do you want employers to learn about you?
Your resume cannot and should not try to tell everything there is to know about you. The only way to know what you should include or exclude is to identify the aspects of your education, experience, skills and characteristics that are relevant to your candidacy. These should comprise the core message of your resume, using strong action verbs. Once you know your core message, you can begin creating your resume