You need dedicated display outs: You could always run a Thunderbolt to HDMI adapter or similar to your display if it does not have a direct USB-C connection, if you need a different display ...

Thunderbolt Macs can connect to USB-C hubs ... There’s one dedicated 10Gbps USB-C data port, HDMI 2.0 port with 4K 60Hz support, and both SD and MicroSD card readers at fast UHS-II media ...