When is there a comma after "that means"? Do you put a period at the end of footnotes? Do the period and comma come before or after the quotation mark? - In this guide you will find everything you need to know about commas, periods and all other punctuation marks; even the most difficult cases of doubt are solved here. Practical examples illustrate each rule - particularly helpful: the tables for commas in conjunctions. The detailed index makes it easy for you to find the answer to your question.