Contact name, phone number, email etc must be legible in order for the employer to contact you. They usually do not research and depending on the line of work they may just skip to the next candidate.
Job esperience section of the application usually has an open box where you can enter any information you want. Learn how to provide relevant information first making it easy for the employer to read and move through the application efficiently.
Don't wait till the last minute. Employers may take this as an indication of your character. Most important do not bother to turn in an application too late,
BLook application once over once completed to finalize and ensure application in clear, grammer, and being turned in on time.
Learn appropriate timelines and ways to follow up if you don't hear a response.