https://support.apple.com/en-us/HT201736 which plug goes into which socket this Apple support page Thunderbolt 3 (USB-C) Mini DisplayPort https://support.apple.com/en-us/HT201736 https://support.apple.com/en-us/HT201736 https://support.apple.com/en-us/HT201736 this Apple support page this Apple support page https://support.apple.com/en-us/HT201736 https://support.apple.com/en-us/HT201736 https://support.apple.com/en-us/HT201736 https://support.apple.com/en-us/HT201736 https://support.apple.com/en-us/HT201736 https://support.apple.com/en-us/HT201736 https://support.apple.com/en-us/HT201736 https://support.apple.com/en-us/HT201736 USB-C with its new lineup of MacBooks https://support.apple.com/en-us/HT201736 ports ports https://support.apple.com/en-us/HT201736 https://support.apple.com/en-us/HT201736 MacBook Pro http://support.apple.com/en-us/HT201736 Apple Inc.: Mac 101: Ports and Connectors https://support.apple.com/en-us/HT201736 https://support.apple.com/en-us/HT201736 https://support.apple.com/en-us/HT201736