I recommend you to read the book `intelligent investor` by Ben Graham. If you don't have the time, read chapter 8 and 20, as Warren Buffett has recommended it.

I recommend you to read the book `intelligent investor` by Ben Graham. If you don't have the time, read chapter 8 and 20, as Warren Buffett has recommended it. It might not teach you how to prosper [under negative interest rate] but I think it will give you something to work on and provide you with a good framework in investing. I'm not a financial advisor so I cannot give you advice but I think investing in yourself is a sound advice.