Some of the terms used in ETFs trading:
Benchmark index - An index that correlates with a fund, used to
measure a fund manager's performance.
Index fund - An index fund is a mutual fund that mirrors as
closely as possible the performance of a stock market index. For example, many
mutual fund companies have since established S&P 500 index funds to mirror that
index by purchasing all 500 stocks in the same percentages as the index.
Indexing - Indexing is a strategy to match the average
performance of a market or group of stocks. A set formula is used to represent
the index's value at any given time. ETFs track indexes.
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.