Style Guide beginning with W

Warn

Warn is transitive, so you must either give warning or warn somebody.
Wars

Write the second world war or the 1939-45 war, not world war two, II or 2.

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Which and that

Which informs, that defines. This is the house that Jack built. But This house, which Jack built, is now falling down. Americans tend to be fussy about making a distinction between which and that. Good writers of British English are less fastidious. (“We have left undone those things which we ought to have done.”)
While

While is best used temporally. Do not use it in place of although or whereas.
Who, whom

Who is one of the few words in English that differs in the accusative (objective) case, when it becomes whom, often throwing native English-speakers into a fizzle.

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Words ending -ee

employees, evacuees, detainees, divorcee, referees, refugees but, please, no attendees (those attending), draftees (conscripts), enrollees (participants), escapees (escapers), indictees (the indicted), retirees (the retired), or standees. A divorcee may be male or female.
Words ending -style

Avoid German-style supervisory boards, an EU-style rotating presidency, etc. Explain what you mean.
Wrack

Wrack is an old word meaning vengeance, punishment or wreckage (as in wrack and ruin). It can also be seaweed. And, as a verb, it can mean to wreck, devastate or ruin. It has nothing to do with wreak, and it is not an instrument of torture or a receptacle for toast: that is rack. Hence racked with pain, racked by war, racked by drought, etc. Rack your brains—unless they be wracked.