Apostrophes

• The apostrophe
  Advice on the uses of apostrophes, with review exercises, from the Purdue Online Writing Lab.
  

• The apostrophe
  Brief set of guidelines, with examples, from the University of Ottawa.
  

• The apostrophe
  Guidelines for main uses, with link to quiz, from the Guide to Grammar and Writing.
  

• Possessives, contractions, and the apostrophe
  Guidelines on when to use apostrophes, from the University of Richmond.

Commas

• Comma rules
  Guidelines and examples for comma use, from St. Cloud State University.
  

• Rules for comma usage
  Eleven tips, with examples and links to several quizzes, from the Guide to Grammar and Writing.
  

• Proofreading for commas
  Guidelines on six main points for comma use, from the Purdue Online Writing Lab.
  

• Using commas
  Guidelines on six uses of commas, with examples, from the University of Richmond.
  

• The comma
  Do's and don'ts for comma use, with a review quiz, from the University of Ottawa.
  

• Recognizing comma problems
  Brief discussion of avoiding comma errors, from the University of Victoria.

Commas with coordinating conjunctions

• Rules for comma usage
  Advice on punctuation with coordinating conjunctions, from the Guide to Grammar and Writing.
  

• Using commas with coordinating conjunctions
  Guidelines on five main uses of commas, with examples, from the University of South Carolina.

Commas with introductory elements

• Using commas
  Information on using commas with introductory elements, from the University of Richmond.
  

• Commas with introductory elements
  Advice on commas with introductory elements, from Old Dominion University.

Commas with nonessential phrases

• Punctuating restrictive and non-restrictive modifiers
  Using commas with essential and nonessential phrases, from the University of Wisconsin at Madison.
  

• Commas that enclose
  Guidelines for using commas with nonessential phrases, from the Langley Research Center (NASA).

Commas with quotations

• How to punctuate short quotations
  Information on using commas with quotations, from the University of Victoria.
  

• Commas with quotations
  Tips on when and how to use commas with quotations, from Old Dominion University.

Unnecessary commas

• Commas that shouldn't be there
  Information on unnecessary commas, from Old Dominion University.
  

• Unnecessary commas
  Twelve situations where commas aren't needed, with examples, from the Keables Guide.

Semicolons

• Semicolons
  Guidance on using semicolons, from the University of Wisconsin, Madison.
  

• The semicolon
  Brief tips on semicolon use, from the University of Ottawa.
  

• Using semicolons
  General guidelines on when to use semicolons, from the University of Richmond.
  

• The semicolon and colon
  Coverage of both types of punctuation, with examples, from St. Cloud State University.
  

• Using semicolons
  Brief discussion of semicolon use, from the Purdue Online Writing Lab.

End punctuation

• End punctuation
  Guidelines on periods, exclamation points, and question marks, from the University of Ottawa.

Other punctuation marks

• Using colons
  Advice on when to use a colon, from the Gallaudet Writer's Handbook.
  

• Dashes
  Advice on using dashes, from the University of Wisconsin, Madison.
  

• Parentheses
  Advice and an exercise on using parentheses, from the Guide to Grammar and Writing.
  

• Brackets
  Advice on using brackets, from the Guide to Grammar and Writing.
  

• The ellipsis
  Advice on using the ellipsis mark, from the Guide to Grammar and Writing.
  

• The slash or virgule
  Advice on using the slash, from the Guide to Grammar and Writing.

Quotation marks

• Quotation marks
  Tips on using quotation marks, especially for quoting from literature, from the Purdue Online Writing Lab.
  

• Punctuating quotations
  Thorough guidelines for using other punctuation in quotations, from St. Cloud State University.
  

• Using quotation marks
  Brief guidelines for using quotation marks, from the University of Richmond.