Question

Do timelines always have to be about history? Can they be about other things? (sports, technology, etc…)

Answer 1

Timelines can be about anything for instance you can put all of your games for sports on a timeline

Answer 2

Everything can be put in timeline irrespective of any particular subject. It can be anything. You can make timeline of Olympic sports, development of computer, use of mobiles and even your achievements from your birth. However, more or less, a particular timeline represents a brief history of the concern subject, providing glances of important events.