Poster from Super Grammar
The A-Z of Correct English by 
McGraw-Hill's Essential ESL Grammar by 
"A school child should be taught grammar
for the same reason a medical student should study anatomy."
E.B. White
(Author of Charlotte's Web and The Elements of Style, with William Strunk, Jr.)
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"In writing, punctuation plays the role of body language.
It helps readers hear the way you want to be heard.”
Russell Baker
(American Pulitzer Prize-winning writer known for his satirical commentary)
In online education and life, your words = you.
In this time of web- and mobile-based communication, you may wonder why it is important to know about grammar and punctuation. While text messages to friends, funny Tweets about a movie, or the quick personal email can be informally written (and formatted), when it comes to your professional image and reputation, what you say and how you say it can have a big impact. Like it or not, people will judge you based on how you write and speak.
Grammar and punctuation are the powerful tools you use to write exactly what it is you want to say.
[from the National Punctuation Day site] "Our written communications reflect our level of professionalism — not education, but professionalism. How we present ourselves through the written word directly affects how people perceive us and whether or not they choose to do business with us."
"The rules of proper punctuation haven’t changed just because we’ve entered the computer age. The casual communication short cuts of e-mail and text messaging have no place in professional business writing where words wield power and decision-makers form impressions immediately. Clarity and attention to detail are imperative; consistently careless punctuation mistakes and misuses cost time, money and productivity."
GRAMMAR
The set of rules that explain how words are used in a language. (Merriam-Webster.com)
Or more simply
"The way we combine words together so that other people can understand us." (Ola Zur, Really Learn English)
Photo courtesy photos-public-domain.com
Parts of Speech (or Types of Words) is a grammar term.
"Every single word can be categorized into one of eight word groups, or parts of speech." (Elizabeth O'Brien, Grammar Revolution)
VIDEOS
Published by the Centre for Academic & Faculty Enrichment (C.A.F.E.).
Durham College, Oshawa ON, Canada
PUNCTUATION
"The marks (such as periods and commas) in a piece of writing that make its meaning clear and that separate it into sentences, clauses, etc." (Merriam-Webster.com)
VIDEOS
Language Log is a group blog on language and linguistics started in the summer of 2003 by Mark Liberman and Geoffrey Pullum.
Grammar of Old English by 
