Can you explain how derivatives work in the stock markets with a very simple example?

Can you explain what causes hope and hype in the stock markets?

Can you explain how a rupee forward contract works and who is the other party?

Can you explain how exactly a buyback works in the stock markets?

Can you explain with an example how the costing will work for a trade?

Can you explain with an example how the cost inflation indexing actually work in practice?

Can you explain simple moving averages, EMA and Bollinger Bands with a live example of prices?

Can you explain diversification in very simple terms and how it is useful to investors in equity?

How do options work in practice and can you explain what exactly is a call option?

Can you explain what is cross margining in equities and derivatives and how is it useful for traders?

Can you explain to me the concept of arbitrage and how and why it is done in the financial markets by investors and traders?