One of the main purposes of the first paragraph of a cover letter is to preview the reasons that you're a great fit for the job. Usually, the details of yourself and your experience come into the later paragraphs. The job interviewer usually wants a short, to the point paragraph about you at first before he or she jumps into the details. Hope this helps :))
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Usually the hook at the beginning or the thesis at the end. hope this helps :)
Don’t understand what you mean by diagrams worked very late
