Colon is used to mark a major division in a sentence, to indicate that what follows is an elaboration, summation, implication, etc., of what precedes it.
Colon is used:
1.At he end of a sentence when a list of items follows, as follows:
The class will expose you to the following topics: physics, biology, and chemistry.
2.Between two main clauses when the second explains or illustrates the first:
Both of my sisters live overseas: Pooja lives in America, and Preeti in London.
QUOTATION MARK
Quotation marks are also called "quotes" or "inverted commas".
It is used:
1. Around the title or name of a book, film, ship etc:
'Titanic' is a 1997 movie directed by James Cameron about the sinking of the ship 'Titanic'.
2. Around a piece of text that we are quoting or citing, usually from another source:
In The Cambridge Encyclopedia of The English Language, David Crystal argues that punctuation "plays a critical role in the modern writing system".
3. Use quotation marks around dialogue or direct speech:
Mary turned to him and said: "Do you like to play football?"
4. Use quotation marks around a word or phrase that we see as slang or jargon:
The police were called to a "disturbance" - which in reality was a pretty big fight.
5. Around a word or phrase that we want to make "special" in some way:
There will be a “Magic show” after the short break.
APOSTROPHE
Apostrophe is used:
1. In possessive forms:
My friend's sister.
2. In contracted forms (the apostrophe shows that letters have been left out):
He has → he’s I would (or I had) → I'd
They have → they've
3.The first two figures of a year are left out:
1966 → '66
4. To show the plural of letters and numbers:
You should dot your i's.
Do you like music from the 1940's?