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.
For example, if you took a job and only stayed there for a month or so, you wouldn’t want to include that position. If you’ve been out of college for more than five years, it’s generally best to remove any internships you’ve had, assuming you have other professional work experience to fill the gap.