<prompt> Human: I am investing my money in things I know - or so I thought.Stocks are easily understood. I have a share in the company, which I buy at a price and sell at a price, and which then returns some of the companys current or expected profits or losses to me the shareholder, either as dividends or as change in share prices.ETFs, I read, are index funds which mix together all the shares of a certain index like Dow or NASDAQ, so if I want to reduce my risk, but dont want to pay the ridiculous fees to buysell small amounts of all the individual shares in an index, I can buy an index fund. My shares in the index fund are backed by the individual shares the fund has bought, and cannot become a total loss even if the ETF issuer files for bankruptcy only if all companies in the index file for bankruptcy at once.And now theres an ETF named SVXY, which tanked from 138 to 10, without any known index tanking. I am not invested in that one, but I cannot see why this shouldnt happen to the ETFs I bought. What part of the picture am I missing here?  <response>: ETFs are not all really just index funds. This is a little bit complicated, but I wouldnt worry about something like SVXY. Its extremely complicated and risky. I would consider this more of a warning to fully research and understand anything before you buy it, because a lot of people that own products like these dont really know what theyre doing. 