Underlying questions

My underlying questions are:
1. What is the cities megacity rank?
2. What urban function does it have
3. What urban sustainability issues does the city have?
4. What is the city's history?
I picked this question because I've wanted to know and because it's cool to know how such an old city was settled and why.
5. Why I chose Kyoto
I picked this question because I picked Kyoto for a reason, not just random.