Dr. Comma is a resourceful app that can help you learn all punctuation rules. It references how to properly use commas, semicolons, quotations, colons, italics, parenthesis, brackets, and dashes. With helpful examples, advice, and techniques, Dr. Comma offers a simple-to-use interface that is packed with functionality.
Incidentally, Dr. Comma is a great tool to have when writing an essay. Unsure about the placement of a punctuation mark? Just launch the app and easily look up the correct one. And with retina display graphics and iOS 4.0 multitasking, Dr. Comma is by far the best way to learn punctuation rules.