Question

tell all the things in sequence that are required to write a essay like introduction body etc

Answer 1

introduction and conclusion was very important for every essay

Answer 2

while writing an essay make sure you have the title in the first place. your essay's:
1st para: should be a brief explaination about the cause of your topic or an introductory para. let it be short and brief, covering all the points.
2nd, 3rd 4th para: should be the longest when compared to the others. it is the main body of the essay. try to include most of the points here.
last para: the conclusion para. need not be long. just one para that's it. try to stress on how u can end the problems or come up with some resolutions depending on the topic

this will surely help u!!!