Do not invest on Bitcoin, and other cryptocurrencies too, if you first, don't read this book. After all, it is a small book, easy to read, speaking simply, to the point, and its cost is low. Would you risk your money by investing in a new and quite difficult to understand/tricky product, such as Bitcoin, so frivolously? Or you will be informed? ... finally, will you win or lose from this case? Book bilingual, English and Greek.