My website does not utilise any accounts system and doesn't run any analytics or trackers, and doesn't set cookies.
My server keeps standard nginx access logs (IP address, user agent, requested path, timestamp) for basic operation and security. None of this data is ever shared.
Cloudflare sits in front of traffic as the network layer. That means Cloudflare's own privacy policy applies to that layer, separate from anything above.
Your browser's localStorage is used to remember your theme preference (dark / light / system). That stays on your device and is never sent anywhere.
Buttons that lead off-site (Example: YouTube) go to third-party services with their own privacy policies and terms. My website has no say in what third parties will do with your data.