Main detail is the main point of your paragraph/essay. you want to be able to start and finish with that so it will remain within the reader thought for longer.
(We Brits have a saying "if a piece of literacy is stuck in your head, the writer has accomplished his or her goal" )
the supporting details are smaller points that correlate and support the main point. note that you should never start with a supporting point, nor should you ever end with one, it is simply there to extend and highlight the main detail. starting or ending with supporting details will ensure that the reader will almost instantaneously forget your essay and they may even find it boring because it doesn't show consistency.
The 1st answer
GIDDY UP!!!!!!!!!!!
<u>Answer:</u>
My dear Father,
I am fine here and I hope you will receive this letter in the best of health. I received your letter ten days ago but I was busy in my midterm exams so couldn’t write to you earlier. You seemed quite concerned about my studies as my previous result was below 80%. The result of the midterm exams has been announced and you will be delighted to know that I have got 88% marks in it. I owe this success to god's favour, your prayers and blessings and the proper guidance of my worthy teachers. For the final exams, I shall have to work hard even more. I find difficulty in mathematics and I am planning to get private coaching in it. I didn’t prepare myself well enough in Pakistan. studies and I am concentrating on it as well. Moreover, I’m trying to improve my writing speed because at times I cannot mange to complete the paper. I want to assure you that I have recognised my failings and now trying my utmost to improve them. I have reduced my sleeping hours.I have learned that one cannot climb the ladder of success with one’s hands in pockets.
I know your wishes and support are my strength and I will prove myself in studies. Pay my compliments to all at home.
Your loving son/daughter,
________
