Conclusions are as important as any part of the essay. This is the part where you don't just summarize but also synthesize the arguments and the details that you have discussed in your essay. It is important to state and highlight your stand in as concise manner as possible. Do not make it look like you are just repeating what you have said in the previous parts of the essay. While writing the conclusion, always keep in mind the purpose of your essay. Why are you writing it? What do you want your readers to get from reading your composition? Hence, it is not only important to deliver a final appeal, but to leave readers with though-provoking statements that may stimulate further discussions with regard to the topic.
Learning things about writing isn't a walk in the park but once you have familiarized yourself, you will be able to write a comprehensive and coherent essay. Practice is a key component of success when it comes to writing. So keep writing!