Rules of writing an essay?, And what are the main factors of an essay?, How to properly write an essay without an errors?

Answer 1

http://www.angelfire.com/wi/writingprocess/

http://esl.about.com/cs/writing/ht/ht_essay.htm

http://owl.english.purdue.edu/handouts/general/index.html

http://grammar.ccc.commnet.edu/grammar/

Answer 2

Can someone explain me how to write an essay?