The advantage of silver, gold, or any precious metal is they can't print more anytime they want to. Printing money just makes each dollar we have worth less than it was yesterday.
Prices rise and prices fall, so naming a good price to buy is very difficult. The good thing about precious metals is the value will never fall to zero like it can with stocks and currency.
You will need to do some historical research on the markets and decide when is a good time to buy. To me, silver is a buy and keep rather than a quick way to make a buck.