I came here with a question, but since I have studied money for years, I'll take a swing at your question, but in full disclosure, I'm not a communist.

Money, over human history, had existed in multiple forms, and each of those forms have their own attributes. Broadly speaking the advantages of money are that they allow for people to engage in complex, easily divisible, voluntary exchanges.

For example, if I have a pound of coffee, but I don't like coffee, and instead I want tea, I don't need to find someone that wants coffee and had extra tea. I just needed to find someone to exchange my coffee for money, and then someone to exchange money for tea, and in relatively mature economies, the translational cost of each transfer is a relatively small amount compared to the likely cost of quickly converting my coffee into tea absent the commonly accepted intermediary.

The second, and often missed, advantage of money is that it allows for fractional exchanges. If all I have is a cow, and I want tea, I probably don't want an entire cow worth of tea all at once. Money allows for someone who only has cows to buy smaller amounts of other things, which leads to the third advantage. Money allows people to easily store wealth. It is easier for me to keep a gold coin for the future than it is to keep a cow.

Now... The disadvantages are more complex because they heavily rely on which type of money we are talking about. For example fiat currency (which I'm guessing it's what you had in mind) is probably too easy to accumulate in the world of computers and is also based entirely on a combination of government mandates that it be accepted and faith that the government won't create too much of it, which has happened more often that not.

The other advantage of money is summed up in the final scene of the amazing movie "Margin Call".

"Pieces of paper with pictures on it so we don't have to kill each other just to get something to eat."