Is there a default confidentiality url I can link to? I am updating my app on the App Store and I now have to give a url for confidentiality agreement.

Is there a default one I can link to, e.g a basic one that Apple would provide for small developers? Or do I have to write one from scratch and host it on my website?
You’ll want to host your metadata sites to avoid rejection in the review process. Something as simple as a GitHub static page should suffice if the content you post is correct and appropriate. Focus on getting the requirements satisfied and the hosting will sort itself out much easier.