According to the Book of "A Random Walk on Wall Street" diversification is usually a very interesting topic, the bad thing is that the book is from the year 1970 and although its advice is excellent, the economic reality is very different, by that time, the Bonds was a safe way of investment, but after the 2008 crisis where they mostly say that the fault was with the banks, they claim that another crash will occur again. Given this, for now the best diversification lies in Real Estate, Gold and Bitcoin, they are the best options in terms of diversification, and in terms of more ease of handling bitcoin influences as the best option.