"For most of the history of the English language, punctuation was a matter of taste. Writers relied on their ears and their instincts to judge where best to mark a pause. But then, with the spread of public schooling in the 1800s, savvy teachers saw a market for a new class of books that would make grammar a teachable science. Perversely, instead of making people more confident in choosing a punctuation mark, rules seem to have had the opposite effect, conjuring up confusion and consternation. Gradually, proper punctuating came to be seen as the province of the elite, although the best writers still followed their own star: 'With educated people, I suppose, punctuation is a matter of rule,' Abraham Lincoln mused; 'with me it is a matter of feeling. But I must say that I have a great respect for the semi-colon; it’s a very useful little chap.'"I didn't know there could be 9 things in total to know about the semicolon! Author Cecelia Watson wrote a whole book about the little thing!
It's available on Amazon: https://www.amazon.com/gp/product/0062853058/.