To connect screens with HDMI directly to the device, you need a USB Type-C to HDMI adapter, e.g. 
Verbatim USB Type-C to (HDMI, 5.50 cm).
For the docks, it depends on whether you're using a newer or an older one. For the new one you need the same adapters as above (USB-C to HDMI), for the older one the adapters Mini Display Port to HDMI, e.g. 
Lanberg Mini DP to (HDMI, 20 cm)