The purpose of the SpanishChecker Grammar Guide is to provide students with key points to keep in mind when they are writing. The guide contains explanations of the main grammatical categories, grammatical rules, exceptions and grammatical errors to avoid. Our objective is not to provide a "laundry list" of every imaginable detail of Spanish grammar. Rather, it is to identify the key points students need to learn in order to avoid making errors in written assignments. In brief, the guide is a valuable resource to help students self-edit their compositions.