A good writing with correct sentence patterns and conjunctions is very easy to read. You should always maintain the three parts below in your writing.
Part 1: Introduction
It should be around 15% of your writing. Use one paragraph.
Part 2: Body paragraphs
It should be around 75% of your writing. Use a couple of paragraphs. Each paragraph should be around 100 to 150 ji.
You need to use as many sentence patterns as you can in your body paragraphs to convey various information.
Part 3: Conclusion
It should be around 10% of your writing. Use one paragraph. You can use the words like まとめると（In summary） or さいごに（Lastly） to start a conclusion paragraph.