What normally resides on the back of a desktop system -- the motherboard and graphics card connection panels -- is at the bottom of the display within a recess. That makes them really hard to get to. The motherboard is on the left, the graphics card outputs in the middle and the display inputs are on the right.
The motherboard does offer a ton of connectors, including two 10 Gb/sec USB 3.1 Gen 2 ports, two 3.1 USB ports earmarked for VR devices, plus two more USB ports -- which you'll note are blocked by the power cord.
There are two HDMI, one DisplayPort, and a Mini DisplayPort input for the monitor, as well as an audio connector. You can see how the graphics cabling runs across the bottom, and there's no way to connect the HDMI's without looping the cable around awkwardly like you see here.
There are vents in the back behind all the components with fans. I wish it were transparent. As it is, the case doesn't support any kind of lighting effects, and you can see how much dust and fingerprints it attracts.