Online (English) Writing Lab

Purdue university has a wonderful portal for students and instructors to access quality material related to English Language available at http://owl.english.purdue.edu/owl/. The available material is in very simple form and aided with exercises as well.

As they mentioned on their site:

The Purdue University Writing Lab and Purdue Online Writing Lab (OWL) assist clients in their development as writers—no matter what their skill level—with on-campus consultations, online participation, and community engagement. The Purdue Writing Lab serves the Purdue, West Lafayette, campus and coordinates with local literacy initiatives. The Purdue OWL offers global support through online reference materials and services.

I must recommend to all students and fellow, specially who has fear of incompetent writing skills like me :)