Grammar stuff...

8 Common Grammar Mistakes You Should Never Make Again
By Gini Dietrich

Affect vs. effect. The easiest way to remember the difference between the two is that "affect" means "to influence." So if you're going to influence something, you will affect it. If it's the result of something, it's an effect.

Impact. Impact is a noun, not a verb. A plane can crash on impact. You can have an impact on something. But you cannot impact something. (When you are tempted to use "impact" as a verb, use "affect" instead; see #1.)

Their, they're and there. You'd think everyone would have learned this rule in fourth grade, but it's a very common mistake. Use "there" when referring to a location, "their" to indicate possession, and "they're" when you mean to say "they are."

Care less. The dismissive "I could care less" is incorrect. If you could care less about it, then you're saying you could care less about the topic, and you've lost the impact you meant to have. To use this phrase correctly, insert the word "not" after the word "could," as in, "I could not care less."

Irregardless. This word doesn't exist. The word you should use is "regardless."

Your and you're. Another mistake you'll often see in people's social media profiles or other content they create is the incorrect us of "your" and "you're." If you mean to say "you are," the correct word is "you're." Use "your" when referring to something that belongs to "you," as in "your business."

Fewer vs. less. Another common mistake, "less" refers to quantity and "fewer" to a number. For instance, Facebook has fewer than 5,000 employees, but I got less sleep than you last night.

Quotation marks. Among the great debates, people ask all the time whether or not punctuation belongs inside or outside of quotation marks. Let's set the record straight. The period and the comma always go inside quotation marks. The dash, the semicolon, the exclamation mark and the question mark go inside when they apply to the quoted matter (if it's not the entire sentence) but outside when they apply to the whole sentence.

Link:
http://www.economicpolicyjournal.com/2013/11/8-common-grammar-mistakes-you-should.html