• Periods go inside quotation marks (always):
• Wrong: He said, "That's nice".
• Right: He said, "That's nice."
• Commas go inside quotation marks:
• Wrong: "That's nice", he said.
• Right: "That's nice," he said.
• It's "all right" not "alright."
• Manor/Manner
• a conversational manner
• live at the manor
• Yesterday, I chose to choose a choice.
• Choose - (verb) to make a choice or selection
• Chose - past tense of verb choose
• Choice - (noun) choosing; selection
• Single thought adjectives have hyphens (two or more words which serve as a single adjective before a noun):
• computer-based
• Lengthily/lengthy
• Lengthily = (adv.) In a lengthy manner; at great length or extent.
• Lengthy = (adj.) Of considerable length, especially in time; extended: a lengthy convalescence.
• Affect/effect
• Common (verb): The arrows affected Ardvark.
• Common (noun): The effect was eye-popping. 
• Rare (verb): Aardvark hoped to effect change within the burrow.
• Rare (noun): She displayed a happy affect. 
• Cordination/Coordination
• Just use coordination
• Opoosed/oposed
• Just use oposed
• Extreemly/extremely
• Just use extremely
• Use commas between adjectives as follows:
• If you can replace the comma with 'and':
• If you can switch the order of the adjectives:
• use a comma
• Else:     
• don't use a comma
• The plural form of analysis is analyses.
• Singular vs. Plural in Subject-Verb Agreement (see here)
• Each is (singular)
• Loose/lose: He tends to lose his keys.” “She lets her dog run loose."

See also non-errors.

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