200 English Grammar Mistakes!: A workbook of Common Grammar and Punctuation Errors with Examples, Exercises and Solutions So You Never Make Them Again

Common Errors You Should Avoid When Writing a Conclusion
You should avoid the following mistakes when writing a conclusion:
Introducing new information: 
Your conclusion should not
contain any information that you have not mentioned previously.
Stuffing too much information into a paragraph: 
In the case of
a book or an academic writing, you may have a reasonable number
of things you want to mention in the introduction. However, you
must avoid stuffing a lot of information in a paragraph. Break
things up to make it easier and organized for smooth reading.

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Not including a topic sentence:
The rule of topic sentence for a
body paragraph also applies to a conclusion. The paragraphs of
your conclusion should have a topic sentence in the first or second
statement.
Lack of cohesion:
Your words and sentences should transition
smoothly. Avoid writing dissimilar sentences together in a
paragraph, to make your writing cohesive and coherent. 
MCQs: Choose the appropriate options from the statements below:
When writing a conclusion, you should ____. (A. introduce a new concept B.
reiterate previous ideas)
Answer: B
A good conclusion should ____. (A. lack cohesion B. be summative)
Answer: B
Thesis
A thesis is also called a dissertation. It is a document that contains your
research and findings you submit to show that you are qualified to possess a
professional certification or academic degree. A good thesis contains what
you intend to argue and how you intend to argue it. A thesis statement often
appears at the latter part of the introductory paragraph of the paper. It offers
the readers a concise summary of the claim of a research paper.
Common Errors In Thesis Statement
The following mistakes in thesis statement can embarrass you: