Many people have no investments at all. They have no savings, no bonds, no real estate, and no other investments. An extremely small way to force yourself to invest something is to use an app called Acorns. You give Acorns access to your bank transactions. For each transaction, Acorns rounds the transaction up to the next dollar and takes the difference and invests it. So if you spent $4.55 on a transaction, Acorns would take $.45 and invest it for you; $43.25, and it would invest $.75; and so on.
While this obviously will not make you a billionaire, it is a simple and passive way to be investing every time you make a purchase. I have been using this for a little while and it works well. I highly recommend it for another tool to make some small investing happen without any effort on your part. Sign up for free at Acorns App.