Money
noun
The お is an honorific that makes this word a bit more fancy. When you're talking about money you gotta be fancy, after all. So, you're basically saying "gold" in a nicer way. What was gold back in the day? It was money.
おかね
The reading for 金 is different from the one you learned with the kanji. Makes sense since this is a single kanji with hiragana attached. Here's a mnemonic to help you: You've saved up a ton of money. With it you're going to buy something awesome. Then, suddenly someone hits you in the knees with a bat. Now you have to spend all your money buying a cane (かね). Sucks for you :(
ウェディングリングは、お金よりも大切です。
Wedding rings are more important than money.
先月はギャンブルで多くのお金が入った。
Last month, I got a lot of money from gambling.
本社のお金のマネジメントの仕方に不正があった。
There were some problems with the way of managing financials at the head office.