How do you make a good description and foreword?

it's me asking again about fanfiction, my question is how do you make a description and foreword sound good or at the most appealing? i saw when i was typing my description was to long or to short or gave away the story to much, same with the foreword. So can someone help me with this? This question is kinda like my question of the do's and don'ts for typing fanfiction just with the foreword and description, so can someone help me please? 

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