Make sure you put the job title and address the letter to the attention of the correct employer contact details.
*On the first paragraph put a brief and to the point self-introduction now this should include a description of your career plan and make sure that you explain your interest in the role and how it relates to your cv
*On the second paragraph put a short description of your skill education and any other relevant information also make sure that this information fits the essential criteria for the role yor are applying for.
*Paragraph three this is a closing paragraph so you should put all of your contact details on this bit
Don’t forget to date your cover letter