Many people make mistakes writing their resumes. And these mistakes that seem to be unimportant to you may turn to be crucial. So writing your resume be as much attentive as possible. And please pay attention to your grammar and style. No slang and grammar mistakes. Typos and misspelling are not allowed as well.
You should remember that your resume is mainly about your qualification and work experience. Be precise and skip unimportant details. Focus attention on your responsibilities and achievements. It is strange but sometimes job seekers mention the reasons they were fired or left the previous job. Actually no one needs this information.