Learning languages

As we all know, language is the most common form of communication between people. But how is it that people know where and when to use certain words to make sentences meaningful? Through learning of course.
Learning begins at the early age and it is not technically learning, it is more of listening to the sound that people around that person produce (parents, siblings ect.). Then trying to repeat these sounds.
As a person becomes older, so does his ability to make more complex sentences become higher. Later, it is not enough just to use verbal language, so a person has to learn to write correctly. It involves learning certain language rules (depending on language studied).
To conclude, learning language is more than just learning to say few sentences. Following and learning grammar, spelling rules will lead to easier and more correct communication.