In the US, hundreds of thousands.
That is a matter of opinion. Many instructors (people that actually do it for a living) will tell you that the best way is in a strong-side hip holster, but many people aren't willing to carry a gun that way. The most basic answer is, there are many ways to carry a firearm. The best way for any particular person is whatever way that suits that person's lifestyle.
You need a license to carry a firearm in many places. You cannot carry one on an airplane.
You can legally carry one laptop from the USA to India for personal use without needing to declare it.
You can legally carry one phone from the USA to India for personal use without needing to declare it.
You can legally carry one mobile phone from the USA to India without having to pay customs duty.
In Utah, a car can legally carry as many passengers as there are factory-installed seatbelts.
You can legally carry up to 2 watches from the USA to India for personal use without having to declare them at customs.
As of current regulations, you can legally carry up to two iPhones from the USA to India for personal use without incurring any customs duties.
Not exclusively. Police carry many different types, styles and finishes of firearm.
As many as you'd like, so long as you can legally own a firearm. California attempted to enact an "arsenal license" in 1994, but it was struck down.
Hundreds.
You will have to contact the AZ govenor and ask.