What are the lot sizes of the underlying stocks and Indices that are available for futures and options trading?

I find that a lot of deep OTM options are available really cheap. Is it a good idea to buy them since my risk is limited?

Do I understand right that commodity futures are a lot like trading stock futures?

What are some of the important basic concepts of futures and options that I need to be aware of?

What are ETFs and what are the various securities that are available for trading as ETFs and what are the underlying securities for these ETFs?

What are the different types of positions that one can take in the futures and options market in India currently?

What are some of the major money market instruments that are available for trading?

Which are the futures and options contracts that are most liquid on any normal trading day on the NSE?

How many stocks and indices on the NSE are currently available for future and options trading?

There is a lot of discussion on the impact of the new Insider Trading rules on pledging of shares. What does that mean and how does it impact Indian companies?

I have heard a lot of the trading book and the trading diary for intraday traders. What exactly are these?