Hi Amit, welcome to Upwork!
The answer to your question is yes, you can use Upwork to advertise your talent and get paid for your work.
Before submitting any proposals, I strongly advise you to read the Help articles from the Getting Started as a Freelancer section and our "A Freelancer's Guide to Upwork". Please also check our educational videos and best practice advice shared by other users:
To help you work safely on Upwork, please have a look at tips and warning signs shared in this thread.
Good luck and keep us posted on your progress!