>we should know about the topic
>we should analysis about it
>we should have an idea in our brain how to present

<first the INTRODUCTION and information
<and finally conclusion

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An essay should have three parts
1. Introduction which gives a brief description of what the topic is and gives an idea of what is to come in the following paragraphs
2. The body- which should have detailed information and points about the topic.
3. Conclusion- in which a summary of the topic of how you are connected with the topic, or what you have to say about it is included.

Be sure to avoid grammatical errors, when you write in English. Also make sure to convey the thoughts well through the sentences, so that the other person reading will get to know what you meant without confusion.