My Lego Network Wiki:Manual of Style/GAS

=Grammar and Spelling=

Affect and Effect
Please see http://www.yourdictionary.com/grammar-rules/affect-effect-grammar.html as writing it out would be tiresome and have too much copied work.

Advice and Advise
Advi c e is a noun, Advi s e is a verb.

It's and Its
It's is a contraction of two words: it is. Its is possessive, like whose, his and hers. Possessive "its" does not need an apostrophe.

There, Their and They're
There is a place or time-frame. "Over there!" or "There once was..." Their is possessive like whose, his and hers. "Their computers". They're is a contraction of two words: They are. "They're playing on the computer at the moment." E.g. They're all over there with their games.

To, Too and Two
To is a preposition. "To go" "To the shops" etc. Too indicates "much"/"a lot" or "also" Two is the number 2.

Who's and Whose
Who's is a contraction of two words: who is or who has. Whose is possessive, like its, his and hers. Possessive "Whose" does not need an apostrophe. E.g. "Whose computer is on?" and "Who's still awake?"

You're and Your
You're is a contraction of two words: you are. Your is possessive, like its, his and hers. Possessive "Your" does not need an apostrophe. E.g. "You're on the computer all the time and your typing speed is extraordinary."

Spelling
Note: Examples are laid out Correct - Incorrect