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One of the best ways to ensure you understand the basic grammatical elements of a language is by seeking the help of someone who’s qualified to teach you. Many community colleges offer language courses, or you can ask around at your local high school or college to see if any English students want to make some extra money tutoring you. Grammar and style guides come in two forms: descriptive guides that describe how people do speak, and prescriptive guides that tell people how they should speak. But language changes and evolves, and the rules of English aren’t always set in stone. There are many style guides that recommend different ways of approaching grammar, and it’s a good idea to read several of them. This will provide an idea of the different ways to approach spelling (such as American versus British), syntax, and style, give you a better idea of the fundamentals of grammar, and show you where the language is adaptable and where it’s inflexible. Some of the most widely used style guides are:  The Chicago Manual of Style, which is often used for social science and historical journals. The Modern Language Association (MLA) style, which is often used in the humanities, in language studies, and in cultural studies. The Associated Press (AP) style, which is used by most news and media outlets. The American Psychological Association (APA) style, which is often used for natural and life sciences, academic journals, and social sciences. Along with the resources available at libraries, the Internet is full of reliable grammar games, lessons, exercises, quizzes, and tips. Many universities will also offer resources about grammar, spelling, syntax, and common errors.  Purdue OWL is an excellent resource that has lessons and different style guide recommendations.  You can also subscribe to daily grammar emails and blogs from people like Grammar Girl.

Summary:
Take a class or see a tutor or teacher. Read style guides and grammar books. Find online resources.