Work Experience. This section should include all relevant paid work experience, including internships. Volunteer or charity work should not be included in this section, or often at all (see below). Make the title of this section a reflection of your paid experience: “Work Experience”, “Employment History”, and “Work History” are all appropriate titles. This should be listed above “Education” unless you are a recent college graduate, since that information is most pertinent to employers.
Your resume is arguable the single most important part of the application process. A well-organized, relevant resume will set you up to get an interview, while a poor resume will get completely lost in the sea of applicants. This is a fairly modern concern, as job postings now get thousands of online applications a day.