@abhinov-singh If you are using Nginx on Ubuntu, the configuration files or symlinks (including ports, etc.) are at /etc/nginx/sites-enabled/
See also which ports are left open by your firewalls (server, PC).
How to install nodebb on Windows 8
I see it's optimized for Windows 10, does that mean it's not going to work on Windows 8. Kinda new to this but have basic knowledge of node
It should be essentially the same. I can't think of anything that would be different.