There are no guarantees in investing. That's the hard truth we all have to learn. Some investments come with low risks while others have a high risk of not working out, but none come with zero risks. When you buy a stock, you need to weigh its potential upside and money-making potential without ignoring the downside.Today, many people divided over Nvidia (NVDA 4.43%). After rocketing higher in the last few years and becoming one of the largest companies in the world by market value, bulls are pounding the t ...