Below are several links that will lead to grammar handouts on the web. These are the same handouts that we use during class.
I strongly suggest that you engage all the handouts, for I expect students to turn in work that does not contain sentence fragments, run-on sentences, and other sentence level errors. For example, if I note that your paper has sentence fragments, then go to the handouts on sentence fragments, so that you can learn how to solve the problem.
Moreover, all of these problems stem from a fundamental inability to distinguish independent clauses from dependent clauses, so students should begin with that particular handout.
Independent and Dependent Clauses (definitions)