Hi Amritaparna! If you are a beginner you can opt from any of the below. I have done these treks and from my experience, I think these are a good option for a beginner. 1) Chandrashila-Tunganath-Deoriatal, Uttarakhand 2) Valley of flowers and Hemkund Sahib, Uttarakhand - This one is easy to moderate level 3) Kheerganga, Himachal Pradesh Hope this helps.
I think in India Gadwal region is best for trekking. Gadwal has all the panch kedar. It starts from Rishikesh and diverts at devprayag towards Badrinath and Kedarnath.