Short, to the point, and more clearly expressed than I've seen almost anywhere else.
http://www.huffingtonpost.com/william-b-bradshaw/national-punctuation-day-_b_1908136.html Other tips, concealed as "...walked into a bar" jokes: A semicolon walks into a bar; it has a drink and then leaves. A dangling modifier walks into a bar. After finishing a drink, the bartender asks it to leave. A question mark walks into a bar? Two scare quotes "walk into" a bar. A gerund and an infinitive walk into a bar, drinking to drink. The bar was walked into by the passive voice. Three intransitive verbs walk into a bar. They sit. They drink. They leave. Finally, more grammar than punctuation: The past, the present and the future walked into a bar. It was tense.
