The United States Internal Revenue Service categorizes income as active income, passive income, or portfolio income.[1] It defines passive income as only coming from two sources, or "passive activities": rental activity or "trade or business activities in which you do not materially participate."[2][3] Other financial and government institutions also recognize it as an income obtained as a result of capital growth or in relation to negative gearing. Passive income is usually taxable.

1. The batting cage idea is very risky. I’ve seen many of them close over the years and it is not anything close to passive income if you want to keep the business going. You have to continually promote it and target youth leagues, coaches, schools etc to catch all of the new players who grow up and want to play. I’ve played at probably 8 batting cages over the years and 7 of them closed.
Acorns: Acorns is a great way to start investing and building wealth. As it turns out, Acorns will pay you $5 to start investing with them for as little as $1. That’s a 500% return, plus it’s probably time you started investing for your future. They even have features like round-up and found money that allows you to get free money from places you already shop at.
I used to be wary of Ebates (now called Rakuten) because I thought the cashback didn’t amount to much, but now I love it.  I’m converted!  To earn money through, all you have to do is sign in and then look for your online retailer and shop through the portal.  Then you get cash back in a few days (it says on the website).

How much money do you need to make passive income?