I'm having trouble resolving websites after setting up Pi-hole with Cloudflare and DDNS. What troubleshooting steps should I take?

First, flush your DNS cache on your client devices (computer, phone, etc.). Check Pi-hole's query log to see if requests are being blocked unexpectedly. Verify your router's DNS settings are correctly pointing to Pi-hole's DDNS hostname. Temporarily disable Pi-hole to see if the issue resolves, indicating a Pi-hole configuration problem. Finally, check your DDNS record to ensure it's current.