If I see some of these common spelling errors once more, I am gonna scream:
Loose is opposite of Tight
Lose is opposite of Find
Your is opposite of My
You're is the short version of You Are
There is opposite of Here
They're is the short version of They Are
There are others that I see quite often, but I don't remember them right now.
This may seem like a puny point, but this Is America where I thought that you don't need an English Degree to know how to spell basic words. I learned this stuff in Elementary School.