Use a colon to introduce a list or to separate a title from a subtitle. Use lower case after a colon when introducing a list and a capital letter after a colon within a title/heading/headline.
- Your email signature must include: your name, job title, department, mobile number and web address.
- Bodies and bugs: Curious kids doing cool science
However, if a list is preceded by a heading, no colon is necessary.
FORMER PRESIDENTS OF THE UNITED STATES:
- John F Kennedy
- George W Bush
- Bill Clinton
- Andrew Jackson