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Books, Videos, Tutorials to learn about different investment options in the financial domain
Those are some very broad questions and I don't think I can answer them completely, but I will add what I can. Barron's Finance and Investment Handbook is the best reference book I have found. It provides a basic description/definition for every type of investment available. It covers stocks, preferred stocks, various forms of bonds as well as mortgage pools and other exotic instruments. It has a comprehensive dictionary of finance terms as well. I would definitely recommend getting it.  The question about how people invest today is a huge one. There are people who simply put a monthly amount into a mutual fund and simply do that until retirement on one side and professional day traders who move in and out of stocks or commodities on a daily basis on the other.