One of the most fundamental aspects of being a good entrepreneur involves understanding the difference between assets and liabilities, and how you can produce passive income. This is a concept explored thoroughly by Robert Kiyosaki in his books and teachings. I highly recommend that you read Rich Dad Poor Dad if you haven't already. I'm mentioning this because I finally figured out how to play his game Cashflow. I'll provide the link below and you can check it out. It's totally free. I think that Cashflow is a great tool to teach yourself and others about passive income and how to live financially free. So if you've got some free time and want to learn more, then definitely check it out below.