@asitkandpal Hi and welcome i think you should start contributing to plone documentation first , its a great process to get familiar with workflow
Welcome, @asitkandpal! Here are some suggestions:
Read through the info and suggestions at https://plone.org/community/gsoc
It boils down to:
@asitkandpal We do have a lot of activity in our Volto (Plone React) project and Pastanaga UI. You can see them in these repos https://github.com/plone/volto and https://github.com/plone/pastanaga so you should try to get familiar with them, and with Plone itself. If you haven't already, please see Plone.org/gsoc6 for more hints (from 2018) on how to get started.