Today my self study was some information about introduction:

I was some research about how we can write introduction, so I surfed in the Internet and used this site http://www.uefap.com/writing/writfram.htm . It explains the process of introduction and it says every part must have arguments without repetition and background of your essay.Also arguments must be clear , and try to put ideas with owns.Then you should try to explain why you are writing this essay.
All of essays consist of preliminaries (title page ) and main text ( introduction, main body and conclusion) end matter( references ).