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Following aspects should be focused
Brief introduction about yourself and your qualification.
Source from where you heard about the vacancy (can add reference/recommendation)
Mentioned your professional experience (if any), expertise and skills that match the current opening (keep short)
Close the later by thanking and mention such phrase "looking forward to hear from you"
Remember cover letter is a one page summary of your resume never makes it too much lengthy and should contain relevant detail.
Situation of the Applicant regarding the job wanted to apply for.
I suggest the letter should not be too short nor too long.
1.Introduce yourself .
2.Mention the position you are applying for (or looking for)
3.Match your skills and experiences with the requirement.
4.Finally pl mention to to read resume for more details.
