What are the recommended security levels for V3
a)Firewall
b) Defense+
Currently set @ Firewall = Train with safemode
Defense+ = Clean PC Mode
Good place to start. After running for a while and having Comodo characterize most of the commonly used programs and network activities, I switched to “custom policy/train with safe mode” and set the Firewall alert level to high. Seems to work well. Haven’t tried “block all/paranoid/very high” and probably won’t. 
You may as well leave it at the default levels forever. If you’re concerned of some malware already existing in your PC before you installed CFP, move Defense+ from clean PC to train with safe. Otherwise the defaults are designed to be as low as possible on popups but completely safe.