The laptop connects to the monitor via USB-C cable that came with the monitor I connected my Keyboard, Mouse, and Definitive Tech Incline Speakers to the Monitor USB ports. My setup came down from using 10 Cables (4 Power Cables + 4 DVI Cables + 2 Sound cables) to a Single USB-C plus the monitor Power Cable.
https://www.amazon.com/Dell-U4320Q-UltraSharp-Business-Warranty/dp/B084LB7RN2