When a writer uses the word “there” when their or they’re was intended, it deals an immediate credibility blow in the mind of the reader, if only subconsciously.

Invest in a dictionary or find a free one on-line to double-check the use and meaning of any word about which you are in doubt, even simple ones.

• There, Their, They’re: “They’re certain there is a difference in their meaning!
  “This is among the top errors that I see in blogs and social media postings. It’s easy to make since the spell checker usually won’t catch it.
• Lose, Loose: The latter is often used when the former is meant
• Where, Were, We’re – “We’re certain we knew where they were.”
• Then, Than, Thin:
• Silicon, Silicone: The “E” makes all the difference. The former is used in making integrated circuits (it’s sand) and the latter is a slippery goop used in lubricants and breast implants. Silicon breast implants are all scratchy and painful, and silicone chips tend to drip/slip out of the computer.
• A border is a boundary. A boarder is a person who rents, or a person using a snow-board.
• Capital/Capitol: maybe not so dissimilar after all…? (cynical comment)
• Few vs. Less: Few is an adjective that means small in number, used with countable objects: “This department has few employees, working for less than ever before.”Less is an adjective meaning small in amount or degree, used with objects of indivisible mass: “Which jar holds less water?”– “Johnny has fewer pennies than Jane.” — “The less popular candidate got fewer votes.”
• It’s, Its: It’s is a contraction for it is, whereas its is the possessive form of it: “It’s important that you know its color.”
• Whose, Who’s – “Who’s here who knows whose this is, or to whom it may belong?”
• Close, Clothes, Cloths
• Breathe, Breath – To breathe, one must take a breath.
• Least, Lease
• Pin, Pen
• President, Precedent
• Principal, Principle
• Lay, Lie
• Deep-seeded vs. Deep-seated: Deep-seeded is a method for planting crops. Deep-seated means that something is ingrained or embedded. “This crop must be deep-seeded if it is to bloom in the fall.” — ” He has a deep-seated compulsion to correct your grammar.“
• It’s a Web Site not Web Sight (Sight is seeing, and a site is where what you are seeing sits — see?)

An Even MORE Recent Example

I recently received some SPAM from a company claiming to be an editorial house. For a lot of money they edit your documents.

Their home page contained seven typos and spelling errors.

Prior to committing your writings to the scrutiny of an unforgiving public eye, run them through a spelling checker.

A typical mistake which is easy to make and hard to catch without a spell checker is:

“We have an unending comnnitment to accuracy in everything we do.”

Depending on the size of the screen font, the letters r, l, n, i, and m, when used consecutively, especially in their lower case, are a mistake waiting to happen.