@ken-b2404 It’s likely that the deployment is successful.
It’s just not necessarily deploying the files that you need it to deploy, or to precisely the right spot.
You can use the Deploy File Browser to check exactly what has been deployed:
https://answers.netlify.com/t/new-feature-browse-files-in-your-deploy-with-the-deploy-file-browser/105196
If you’re working with a static site, you would expect there to be an /index.html file.
But if you’re accidentally deploying source files, or a nested structure, it may be missing.
It’s likely that you just need to ensure your Build Configuration (https://docs.netlify.com/configure-builds/overview/) is set properly depending on your own projects requirements.
If you have a public repository you can link to it, and either myself or someone else could guide you regarding the settings that will work.