Using punctuation is similar to giving route directions. Punctuation tells the reader how to read the sentence to understand the meaning.
A period tells the reader where the sentence ends. A comma separates the sentence into meaningful parts such as separating an introductory word or words from the main clause and marking off items in a series. A comma also tells the reader what information is incidental and not necessary to the main idea. They are used to separate a signal phrase from a sentence quote.
An apostrophe tells the reader that something belongs to someone or something. They also indicate if a letter or letters were omitted from a word. Quotation marks tell the reader the words were spoken or written by someone else.
These are just some examples of why punctuation is so important. However, to use grammar to communicate more effectively, we must learn the rules.
Learning grammar is a skills acquisition, which means practice is required to learn and improve.