Focus on the most importance: A resume or a resume both requires focusing points. You should go deeply into the most important points about your qualification and knowledge about the job and the company. You may make bold or italic important points (if printing).
The length of your resume should not be more than 1 page and there must be a full name with signature at the end of the page. Also, do not forget that the content of the resume and it must not be different in information, especially important ones. However, it is neither a part nor a summary of your one. So, differentiate the it is function and resume.