What we have to learn to design a app

Answer 1

Please don't use such tag "krish", it's so irrelevant.

How would "krish" tag help in fastening the search?

A valid tag to your question would be "android", "iOS" or just "app" or all of them.
(Is "krish" a new OS in the market?)
I hope you understand :)

Answer 2

Hope this satifies U
https://learnappmaking.com/how-to-make-an-app/

Answer 3

Thanks RKK