How to write an English composition well?

1` make you composition logical and coherent.
use some link word such as "furthermore","otherwise","nevertheless"
and they will enable your composition tobe easily grasp.
2` use correct grammer
i recommend you to read a authentic grammer book,that will help you a lot.
3` nice sentence structure.
read more and you`ll find sentence structures that wirters like to use.collect them and use them in your passage.
4` good vocabulary
words like"good" can be replace by "marvellous","fabulous"
words like"important" can be replaced by"cardinal","pivotal"
likewise...replace your words
5`make your passage close to the topic
give some accurate examples is a good way,and don`t talk about things that have no relationship with the topic
wish you improvement~

要看你要写多长,
一般来讲,开头的第一句是controlling idea,就是先表达你的主管点。
e.g.: eggs will improve our health.(controlling idea)
然后你需要3个arguments（论点） to support（支持） your idea，然后你就可以从第一个argument 开始解释, 给一些example...

1.what?——At first, you should tell others what you want to say.
2.why? ——Then you show your purpose. / how——you describe how it is/happened.