Example: The dental hygienist cleans teeth; the receptionist answers the phone, makes appointments, files patient records and verifies insurance coverage; and the office manager handles customer ...

Sedentary lifestyle: Regular exercise is important for your overall health, and it can help reduce your colon cancer risk.

Colons can introduce a list, while commas are used to separate items in a list. For example: You will need to bring the following: sleeping bag, pillow, pyjamas, water bottle, waterproof jacket ...

That time machine manual is a good example. Look at all of that text! Bullet points could be used to make it more appealing. The first thing you need when using bullet points is a colon.