I have a Dell U2720Q monitor that accepts HDMI 2.0, DisplayPort 1.4 and USB-C. I use USB-C because the monitor acts as a hub for a range of peripherals (keyboard, mouse, webcam, speakers, etc.etc) and ...
Start by checking if your device and GPU support multiple displays. If its capable, ensure you have all the cables to connect the monitors. Next, hook up all the cables to the monitors and your PC ...
As long as you're gaming within specific resolutions and refresh rates, HDMI 2.1 is just as capable as DisplayPort.
Focus on the essentials while you wait for PC hardware prices to fail ...