Ever wonder where your industry is headed, then take a look at Google Trends.
This tool allows you the ability to see what people are searching for related to your keyphrase, as well as what locations are doing the search.

For instance, lets say you run a used car business. You may want to go to google trends and see what people are searching in relation to cars. This will help you better to target your keywords throughout your marketing campaign.

key phrase – “used cars”
https://trends.google.com/trends/explore?q=used%20cars&geo=US

as you can see the top states for the past 12 months using the key phrase “used cars” is

1 West Virginia 100
2 Louisiana 95
3 Alaska 91
4 Mississippi 84
5 South Carolina 82

The referencing key phrases for the past 12 months are further listed as
1 cargurus +550%
2 cargurus used cars +500%
3 cargurus used cars near me +450%
4 kelly blue book value for used cars +350%
5 carfax used cars +250%

Combined with the previous information, if i was to run a used car campaign… say on adwords or facebook, i would want to refrence the following keywords in my ad and target the the states located.

so an ad may look like this
Before you check out Cargurus visit us for a kelley blue book trade in for your used car.
and just target the states West Virginia, Louisiana, Alaska…

this would also be in your fb posts
you may want to find an article on cargurus and share it for example
Cargurus News

Finally one other aspect is to compare your trends with Googles Keyword Tool
https://ads.google.com/aw/keywordplanner/home

enter the key phrase “used cars”, then look for items in the list that have a large monthly search volume, but with low competition.