Make your resume and resume differ from those of other candidates. As such, you should never start your resume with such general salutations as dear sir, or dear sirs,... Normally, when a company posts publicly a recruitment ad, it will surely address the name, address and contact number so as the resumes may be sent to correct address. Do not miss these important details and do not forget to start your resume professionally with clear address of the company and even, the name of the responsible person. The employer will understand that you have researched carefully about them and correct your resume before sending to them, and, you have gained a good score then!
The employers are very busy as they may receive hundreds of resumes and resumes each day from different candidates. So, think carefully before you send your resume and resume to an employer is a good way to win over other candidates. Do not expect to win the employer when your resume and resume are common without any particularity. So, do not waste time sending imperfect resume and resume to different employers because your chance of getting to the next round is not significant at all.
A resume should start with short but clear and open sentences. Your goal is to show that how much you understand about the job, why you love that job and how much experience you have gained when doing similar jobs. Then, why do not you put those in your resume and it in a professional way? The strength of your resume depends on your confidence, but confidence here does not mean arrogance. Your resume must absolutely avoid words and phrases that may make the readers think that you are too sharp and even deceitful. Use the resume and resume to make the readers understand that you are sensitive, professional, politely and well qualified.