How do you select a Keyword?

You can refer this
How to Choose the Right Keywords for SEO [2022]

7 Tips on Choosing the Right Keywords for SEO you can take this as a reference.

At the beginning of your keyword research, use Google Keyword Planner or a free tool like Ubersuggest.
The initial step in keyword research is to choose your main keyword. Enter it into the Google Keyword Planner or ubersuggest by selecting the country name you're after.