Use “e.g.” to introduce one or more examples.
Place it after a comma in most sentences.
Use it before a list of examples.
Do not use “e.g.” when you mean “for example” in formal writing unless the abbreviation is acceptable.
Example: I enjoy citrus fruits, e.g., oranges and lemons.
Example: Bring warm clothing, e.g., a coat, gloves, and a hat.