Simple Tips : How to Make a Good Written English

First, check your spelling and capitalization.
Second, check your grammar.
Third, make sure that your sentence make sense.
Fourth, make sure all sentences are connected (in writing paragraph)

Those are basic steps how to make a good written English. This unity of steps can be applied by all people. If one of them cannot be applied, it means that your English is still bad. When you realize your English is bad, please accept any correction from your more-legible friend even if his/her correction hurts your heart because he/she proves that you've done many mistakes. You've to think logically.