A winning cover letter generally consist of three parts which amount up to three paragraphs. In the first paragraph, you will detail why you are writing the company. This will provide context to your intentions for writing the company, which is to apply for a new job. Also, try to provide clues as to where you found out about the job posting and what got you interested in applying. The second paragraph serves as the gist of your cover letter. Here is where you explain what you can offer and what skills matched the job requirement. If you have other skills or achievements, make sure to point them out by referring to your resume. Make sure you can convince them to read your resume.
That leads to three axioms: 1. You can make yourself the obvious choice for the job and attract many offers, but to do it, you must be the candidate who maximizes every portion of your job packet to attract the recruiter's attention, so 2. You must have a system that gives you a cover letter format [http://coverletterhelp.info] and specific additional techniques optimized to get you calls, and 3. Your system needs to be automated so it creates cover letters very rapidly and very easily so you actually do it every time (and don't simply intend to do it).