Hi Shivani,
Welcome to the community.
There are a lot of ways you can contribute to. This is true for Ansible project as well as every Open Source Project.
For example,
1. Join Mailing list (which you already did)
2. Join IRC channels
3. Read the documentation, try things mentioned and report bugs if they fail
4. Try Ansible and practice things according to documentation
5. Run already written tests
6. Write new documentation
the list goes on and on.
All repos under Ansible GitHub org have "easyfix" label, you can filter and start working on them.
Make sure you adhere to "Code of Conduct" and be nice to everyone.
Few links to mention here -
Feel free to reach to me or anyone on the IRC channels.
And again, Welcome to the community. Happy Automating.