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How do I watch traffic to and from on my Mac. Newbie

Ok, complete newbie here. I'm running Wireshark, lates and latest OSX (10.15.5) but can't get a grip of filters.. I either see everything or nothing? I'm trying to see why my Mac is being denied a connection to by cURL. cURL error 28. Meaning it's either blocked or not resolving. But - I can't figure out how to tell Wireshark to see what's going on?

Could someone point me in the right direction please. Thanks