if you're looking for true grammar advice--on the proper use of nouns, pronouns, the other parts of speech, and sentence structure--you won't find it in this article. My online editorial style manual provides some grammar advice, though its editorial style preferences (for capitalization, numbers and so on) also aren't grammar "rules."
affect, effect Often misused, confused or overused. Usually used as a verb, affect means "to influence, to have an effect on, to change": The pesticide will affect the stream. The new feature should affect sales. Better yet, use a verb that's describes the effect more precisely, like pollute the stream or stimulate sales. Avoid using affect as a noun that sometimes means "emotion" to psychologists. Effect is usually a noun, meaning "result," "reaction" or "consequence": The effect of the project was disappointing.Avoid using effect formally as a verb, meaning "to cause, to bring about, to produce": She will effect many changes in the group.Instead, use simpler, less formal bring about or cause.
bring, take Often confused. Their meaning is similar, but their points of view are different. Bring suggests motion toward the speaker or writer: We bring in the mail. If something is coming to your home or office or city, someone is bringing it. Take suggests motion away from the speaker or writer: We take out the recycling. If something is leaving your home or office or city, someone is taking it. Usually, the distinction is easy to make. But it might be best just to say what feels natural to you if you are offering dessert for a potluck dinner: You'll be bringing it to the potluck (its destination), but you'll be taking it with you from home (its origin). Either way, it'll probably be delicious!
capital, capitol Often confused or misspelled. Capital is a city, the seat of government. Do not capitalize: Salem is the capital of Oregon. Capital city is redundant. Capital also refers to money. Capitol is the building in which the U.S. Congress or the state Legislature meets. Capitalize U.S. Capitol and the Capitol when writing about the building in Washington, D.C., and do the same when writing about state capitols: The California Capitol is in Sacramento. Capitol building is redundant.