Attached below is a highly readable article which explains the profound theory of inflation in simple words and examples at:

"錢為什麼越來越不值錢了？"

https://www.toutiao.com/a6515644947998179853/

FYI, so far the only country in the world that being immue to inflation is America, for she is the only one who can "export" inflation to other countries with the valueless dollars backed by her stregth of military power.