Answer:
1. Flags often represent the upbringing of a country with symbols or colors representing things about the country and the community.
2. While this statement is mostly true, not all countries have symbols on their flags. In fact, a fair share of them have colors that each represent something about the country, community or upbringing. See #1 for more information.
3. Questions one may have about the rainbow flag:
Origin: How did it originate? Who created it? How did they come up with it?
History: What did the flag go through during its creation and uprising from outside parties? What about people in the community?
Symbolism: Did the current flag ever represent something else? Was there one before it, and if so did it have any other meaning beforehand?
3a. G**gle or people within the community.
Hope this helped!