Help with my new app

I have an idea to create an app. I want to create an app in which people can locate the local grocery shops near to their current location. But i dont have any idea on how to create one. i want advice on what can i do and how to do it!
Please do help!

The forum had information on the solution of this problem. Determine the coordinates of the position of the device, determine the coordinates of the stores. Calculate the distance using a special formula and select the smallest of them.


Wat type of formula shld i use?
And can u tell me of any video which can help me learn more about location tracking!
Thank You for ur advice!

Haversine formula.

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