How do you find a need in the market?

Hi guys, I hope you are well.
I am lacking a little bit market knowledge.. so I m wondering how do you can find a need in the market place? but more specifically how do you find a need in a sub-niche that you are passionate? What tools do you use?
Thanks a lot. I m new here but damn, this forum is so god damn full of gold knowledge.

There are tools such as NicheReaper, niche finder and several others out there.
Downside of these are you'll have 100 people chasing the same thing.

Look at Google Trends for ideas, this is free to use.

Another free way to research potential costumer's needs that I use is to mingle with them on their respective FB groups & subreddit etc..

It's time consuming but it's worth it..

Here are some threads from the forum that might help you:

hekke's Niche Selection Guide
https://www.blackhatworld.com/seo/hekkes-niche-selection-guide.819406/

A Complete Easy To Follow Guide For Finding Money Making Niches
https://www.blackhatworld.com/seo/a...guide-for-finding-money-making-niches.832275/

Niche Ideas and Selection
https://www.blackhatworld.com/seo/guide-niche-ideas-and-selection.1019141/

Hope this helps..
Good luck on your journey..

Let me quote this from Seth Godins' book titled "This Is Marketing":

Harvard marketing professor Theodore Levitt famously said, “People don’t want to buy a quarter-inch drill bit. They want a quarter-inch hole.”

The lesson is that the drill bit is merely a feature, a means to an end, but what people truly want is the hole it makes. But that doesn’t go nearly far enough. No one wants a hole. What people want is the shelf that will go on the wall once they drill the hole.

Actually, what they want is how they’ll feel once they see how uncluttered everything is, when they put their stuff on the shelf that went on the wall, now that there’s a quarter-inch hole. But wait . . . They also want the satisfaction of knowing they did it themselves. Or perhaps the increase in status they’ll get when their spouse admires the work. Or the peace of mind that comes from knowing that the bedroom isn’t a mess, and that it feels safe and clean.

“People don’t want to buy a quarter-inch drill bit. They want to feel safe and respected.” Bingo.