No matter what your business idea is, it has to do at least one of these 2 things:
1) solve a painful problem that a lot of people have in common
2) be very entertaining
If you do both then you're awesome. If you do neither, your idea is probably worthless. As for the vast majority of us entrepreneurs, we are trying to accomplish goal #1 above. If that is what your business idea is trying to do, there is one sentence that you must be able to complete with confidence. Here it is:
FOR <A SPECIFIC GROUP OF PEOPLE>,
WHO SUFFER FROM <A SPECIFIC KIND OF PAINFUL PROBLEM THAT HURTS A LOT> ,
MY SOLUTION IS <A SPECIFIC THING>
THAT SOLVES THIS PAINFUL PROBLEM <BY TAKING A SPECIFIC ACTION OR BY MAKING THE PROBLEM GO AWAY>.
You'd be SURPRISED how many people I've met along the way who believe that their idea is the next best thing since sliced bread and can't even complete this sentence! Among our clients, we've come across many budding entrepreneurs who forgot to ever think about this simple sentence, and then tried to reverse-engineer their solution to fit a target customer audience with a specific problem. Usually this results in added time, effort, and cost. Sure, this kind of failure has been euphemized as a "pivot" in startup parlance - but make no mistake about it - failure without effective learning is simply a waste of time and opportunity.
If you think you've got a brilliant idea that can be monetized, do yourself a favor and finish that sentence with confidence! We require all our clients to start with this. Trust me, it's better to get this straight up front rather than spend time "fixing" your idea after it's way too late.