"In linguistics, the grammar of a natural language is its set of structural rules on speakers' or writers' usage and creation of clauses, phrases, and words. ...
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The term can also refer to the study of such rules, a subject that includes phonology, morphology, and syntax, together with phonetics, semantics, and pragmatics. There are two different ways to study grammar right now: traditional grammar and theoretical grammar.
Fluent speakers of a language variety or lect have internalised these rules. the vast majority of which – at least in the case of one's native language(s) – are acquired not by intentional study or instruction but by hearing other speakers. Much of this internalisation occurs during early childhood; learning a language later in life usually involves more direct instruction." - (en.wikipedia.org 19.10.2023)