I am Studying AWS cloud on udemy and I have explored some service like EC2 but other services are chargeable, how shall i proceed?

I think I saw somewhere Oreily AWS sandbox or something if you have access to that you can have time limited sandbox for practice.

To payment karneka viduuu.. sab free me nehi milta he

You can use your tcs mail id, all the charges will be brone by tcs. If someone questions you, just tell them that it is for practicing purposes.