From time to time, as I'm dabbling in niche research, I'll go to the simple free Google keyword tool and start typing in phrase starters, always checking the box that says "Only show ideas closely related to my search terms."
I might choose:
"how to buy" or "how to buy a"
Today I did "how to sue" for one of my readers who needed an example of a niche she could build an empire in (she's a law person). She could do a whole series of "how to sue" courses that are specific in nature.
Then I typed in "how to get"
I discovered there's a ton of people needing to know how to get rid of hickeys (hickies, a hickey, etc). LOL! About 74,000 people looking for that one.
This is just an example of how you can sometimes stumble on things. Research shows women are searching for how to get guys a lot, and there's all sorts of how to get over a broken heart searches.
Dig down when you do phrase searches, like this:
The hickey one made me type in "how to get rid of" and that resulted in people wanting to know how to get rid of:
All of these are things you could easily put together a report on and create a site to sell these for not a lot of money - think $7 for fast fixes. Put enough together and you have something building.
Another one? Search for "learn how" and get these:
to play guitar
Dig in a little more by typing in "learn how to write" and get:
There are many ways to get some niche ideas brewing. This is one.