Do you want to be a writer? Or you need good writing skill in order to meet your professional requirements? Duke University has come up with the course English Composition - I which is available online on coursera.
The course will teach the students to read carefully, write effective arguments, understand the writing process, engage with others' ideas, cite accurately, and craft powerful prose. The course will start on November 7, 2016. It is a ten weeks course. The course is free of cost and is available to students across the globe.

Given is the syllabus of the course, Each module is to be completed in a week's time.
The course has been designed by the Duke University. The university has about 13,000 undergraduate and graduate students and has a world-class faculty.
Go to the official page of coursera and get enrolled in the course.