There are a number of resume dos and don'ts. You are not trained to create resumes that are optimized for the ATS, specifically format, content and readability which is essential to gaining traction on your search. Resumes are typically lengthy and don’t focus on what hiring managers are looking for i.e. listing all your job duties. Some have grammatical errors which will likely eliminate you immediately.  Overall, most people have difficulty telling a concise, relevant and compelling story. When you do so much, it’s challenging to prioritize.