The Standard Marks for Grammatical Punctuation

In other words, punctuation you'll use most of the time.

Most punctuation breaks up grammatical parts of sentences--phrases, clauses, appositives, nouns of direct address, exclamations, conjunctive adverbs or parenthetical comments.  Here are the punctuation marks to use in the different situations.
 
 
Introductory parts of sentences
Set off an introductory phrase or clause or direct quote 
or noun of direct address or exclamation with a comma.
Interrupting parts of sentences
, ,   -- --   ( )
In the middle of a sentence, set off 
a phrase or nonrestrictive clause or appositive 
or noun of direct address or exclamation or direct quote 
with two commas or two dashes or two parentheses.
Concluding parts of sentences
,  --  ( )  :
Set off a concluding appositive or nonrestrictive modifier 
or noun of direct address or direct quote with a comma, 
a dash, or two parentheses.  If an appositive is a list, use a colon.
Two independent clauses
.  ;
Separate independent clauses with a period or a semicolon 
even if there is a conjunctive adverb between them.
Two independent clauses 
with a conjunction between them
,  .  ;
When independent clauses have a conjunction between them, 
you usually separate them with a comma. But 
since they're independent, you can use a period or semicolon.
Items in a list
,
Separate items in a list with commas.  Standard English 
puts a comma before the and, but journalism style doesn't.
Items in a list 
that already have commas
;
Use a semicolon to separate items in a list when one or more 
of the items are already punctuated with commas.
 
 
Main punctuation page
?  !
""   ''
'