In today's digital age, stapling or paperclipping a resume is becoming less common, as most job applications are submitted electronically. However, if you are submitting a hard copy of your resume in person, such as during a job fair or informational interview, it is generally recommended to use a paper clip, rather than a staple. This is because a paper clip is less intrusive and allows the recipient to easily remove your resume from the rest of the materials you have submitted.
It is also worth noting that, in some cases, the recipient may prefer to scan or copy your resume, and a paper clip will allow them to do so without damaging the original document.
In general, the goal of submitting a resume is to make a good impression and to make it easy for the recipient to review and keep your resume on file. A neat and professional appearance, with a paper clip rather than a staple, will help to achieve this goal.