In English, there are two kinds of grammar: prescriptive grammar & descriptive grammar.
What is grammar and what are its types?
At a high level, the definition of grammar is a system of rules that allow us to structure sentences. It includes several aspects of the English language, like: Parts of speech (verbs, adjectives, nouns, adverbs, prepositions, conjunctions, modifiers, etc.) Clauses (e.g. independent, dependent, compound)