You don't give us enough information to answer.
First, you say you want "low investment." Does that mean you simply don't have a lot of money to spend? Or are you looking for one of those imaginary "make tons of money without having to lift a finger" online "opportunities"? Having not much money to invest isn't necessarily an issue. Being unwilling to invest time
, on the other hand, is a huge
Second, you have told us absolutely nothing
about where you're located, what you're interested in doing, what talents / skills / experience you already have, what sort of market research you've done, what ideas you might be considering.
You're going to have to give us a whole lot more to work with before we can make any recommendations or give you any ideas.