Some of the terms used in ETFs trading:
Enhanced
A fund designed around an index but not tracking it verbatim. Often enhanced
funds bet extra heavily on an index or bet against an index by selling it short.
Large Cap
Short for large capitalization, which describes companies whose market
capitalization (total value) is among the largest in a market.
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.