How can I troubleshoot DNS resolution issues using Cloudflare or Google DNS?

To troubleshoot DNS resolution issues, you can use tools like `nslookup` or `dig` to query Cloudflare or Google DNS directly. If you're experiencing problems, you can check your domain's nameserver settings, verify that your DNS records are correct, and test your connection speed to ensure there aren't any network issues. Also, check Cloudflare's or Google's status pages for any reported outages.