Punctuation is not taught well in schools. It can be a dry old subject for children, but decent punctuation is vital if a piece of writing is to communicate with any degree of sophistication.
When you reach the end of a sentence, you need a period, question mark, or exclamation point. Phrases or subordinate clauses standing alone are missing a subject or a verb or are stated in such a way ...
The Romans and the Ancient Greeks didn’t use punctuation at all. They didn’t even have gaps between words. This is called scriptio continua, writing as one continuous string of capital letters, so ...