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The rules and information provided in this article will not teach you everything you need to know about English grammar. This article is intended to serve as a starting point in your studies. The actual subject of English grammar is much more complex, and you will need to devote a lot of time and effort if you really want to learn it. If you are learning English as a second language, compare the rules of English grammar to the grammar rules of your native language. Some aspects will be similar while others will differ.  When the rules are the same, rely on the knowledge you have of your native grammar to help you with English grammar. When the rules differ, devote more time and concentration on practicing those aspects of English grammar as you study. People who do a lot of reading tend to be more proficient with English grammar in their own writing and speech.  This does not refer to grammar books. Grammar books are helpful, of course, but the principle of this step is a different one. Read books, magazines, or other materials written in English that you enjoy. The more often you read, the more familiar you will naturally become with the way that grammar is used in word, sentence, and paragraph levels. Learning the rules of English grammar is an important step, but you will be able to put those rules into practice better if you are actually used to seeing proper grammar. If you are currently in school, look for a special elective class that focuses on grammar or a tutoring opportunity provided through your school. If you are no longer in school, consider taking a grammar class at a community college, community center, or library. You could also look for a class online. For non-native English speakers, look for classes specifically designed for students who are learning English as a secondary language. These classes are usually labeled as ESL (English as a Second Language), ENL (English as a New Language), or ESOL (English for Speakers of Other Languages) classes. If formal classes do not help, find a mentor who can review grammar rules with you one-on-one. This mentor could be a teacher, professor, or professional tutor. On the other hand, it could also be a parent, sibling, friend, or other relative who has a strong grasp of the English language and is willing to help out. Go to a bookstore and purchase an English grammar workbook, or hop online and access some free grammar resources through the Internet. As a general rule, look for Internet sources that come from educational (.edu) websites. Examples include:  The Guide to Grammar and Writing by Capital Community College Foundation (http://grammar.ccc.commnet.edu/grammar/) Purdue University's Online Writing Lab (https://owl.english.purdue.edu/owl/section/1/5/) Above all else, practice makes perfect. The more you can practice English grammar, the better you'll get with it.
Understand that this is just the beginning. Compare grammar rules. Do a lot of reading. Take a class. Find a mentor. Look for additional information on your own. Practice.