I am new to XWiki and looking forward to contribute and gain some experience. I would to love to try solving existing issues. Thanks in advance for any help.
Welcome to the XWiki community!
If you want to try solving issues you might want to learn how XWiki applications work and how they are developed.
Here’s a link to a tutorial for creating a simple XWiki application: https://youtu.be/upQWknV06D4
After learning the basics, you can try creating your own simple applications or go to http://jira.xwiki.org and navigate to a project of your interest and try solving some issues from there.
It would help to know what kind of technologies you want to work in so the suggestions can be more specific.
Welcome Ayush !