Full Stop (Period):

Use a full stop (also called »period«) to end affirmative sentences.

Example: I go shopping every day.

Use a full stop to end orders.

Example: Leave me alone.

Exclamation Mark:

Use an exclamation mark at the end of a surprised exclamation (usually starting with »how« or »what«).

Example: How awful! What a chaos!

Use an exclamation mark at the end of a wish.

Example: Good luck!

Use a questions mark at the end of a question.

Example: What's your name?

Use a questions mark after question tags.

Example: You are Connor, aren't you?

Use a questions mark at the end of a request.

Example: Could you give me the book, please?

The semi-colon indicates a stronger division than a comma, but a weaker one than a full stop.

Use a semi-colon in enumerations if a comma is already used to further separate an item of the sequence.

Example: We have business partners in Edmonton, Canada ; Waterford, Ireland; Brisbane, Australia; and Durban, South Africa.

Use a semi-colon between two main clauses if they are not separated by and, or etc.

Example: The rain stopped; the sun came out again.