How many USB Cables do you always keep and use? And where do you use them?

At least zero.

One in the car, one in the bedroom, one in my office and a new 60W 6 way charger and several Anker lightening cables as a charging station in the Kitchen..
So far had 4 iPhones and an iPod touch on it all charging at 10w each.
Nothing worse than 3 kids turning up with 3 devices and no cables!

2 in the bedroom, 3 downstairs and 1 in the car.

Two in the bedroom with one charging iPad. one charging iPhone through Macbook. One at work with an external battery.

I recently want to buy some cable, any recommendations?

Anker cables

http://www.amazon.co.uk/Apple-PowerL.../dp/B01ALHLPFA
I bought this 3 cables in one box, hope it can meet my expectations lol.