Tips: Are there any Dow Jones Industrials, S&P 500, Nasdaq 100 or Russell 2000 ETFs?
Yes, there are numerous funds that track these and other popular indexes. Remember that Dow Jones and Standard & Poor's maintain their respective indexes, and that fund groups license the indexes so that more than one fund can end up tracking an index. The most popular and most traded index tracking ETFs are QQQQ (tracks the Nasdaq 100 index performance), DIA (tracks the Dow Jones Industrials Index performance), SPY (tracks the S&P 500 index performance) and IWM (tracks the Russell 2000 index performance).
Naked options trading is very risky - many people lose money trading them. It is recommended contacting your broker or investment professional to find out about trading risk and margin requirements before getting involved into trading uncovered options.