Hyperinflation and basic economics's specifically in Germany before WW2, how was this caused?

Always been interested in this but never understood the economics but basically the period between WW1 and WW2 In Germany a time of great strife what was the cause of hyper inflation explained in the most basic of terms. What causes money to loose its value and on a side note why is the exchange rate between the British pound and Japanese yen still like 1 : 150