Ask our Prime minister and all CM's in India. What is our future?

Pramoda Lochan Kedarisetti .. Pramoda, In my opinion you can find answers to your question in 3 general ways; (1) a course in introduction to rockets and rocket design, (2) a Google and especially Google Scholar searches of; “history rocket design and development” — “comparison of military vs exploraatory rockets and “rocket design and development” (3) join a model rocket club and begin to design, make and launch your own. I suggest #3. its the quickest way to see effect of design variations as well as being an immediate introduction to trying to go higher, carry more people, supplies or explosive weight, the aerodynamics and recovery ideas. Links below are a way to start:

1)__ INTRODUCTION TO AEROSPACE FLIGHT VEHICLES

https://eaglepubs.erau.edu/introductiontoaerospaceflightvehicles/chapter/history-of-space-flight/

2)__ A Brief History of Rocketry

https://solarviews.com/eng/rocket.htm

3)__ History of Rockets

https://www.space.com/29295-rocket-history.html

4)__ Design a Rocket in 6 Steps

https://blogs.nasa.gov/Rocketology/2015/07/09/designing-a-rocket-in-six-easy-steps/

5)__ Design of Liquid Propellant Rocket Engines, Second Edition

https://ntrs.nasa.gov/citations/19710019929

6)__ DESIGN AND DEVELOPMENT OF

SINGLE STAGE-TO-ORBIT VEHICLES

https://secwww.jhuapl.edu/techdigest/Content/techdigest/pdf/V11-N3-4/11-03-Billig.pdf

7)__ Aerospike Rocket Engine Design & Development

https://www.academia.edu/43471615/Aerospike_Rocket_Engine_Design_and_Development

Pramoda Lochan Kedarisetti - - Pramoda, The link below is to a wikipedia article introducing the "Tsiolkovsky rocket equation”. It describes the motion of vehicles that follow the basic principle of a rocket. — It’s credited to the Konstantin Tsiolkovsky who derived it. Independently William Moore, Robert Goddard and Hermann Oberth found the same thing. The work of all 4 is a background for rocket design in last 200 years

https://en.wikipedia.org/wiki/Tsiolkovsky_rocket_equation