How do I communicate with an embedded PC with no monitor?

I want to try out an embedded PC I bought for a robotics project. It takes an HDMI input but I don’t have a monitor right now. It has two LAN ports and a USB 3.0 port, and I have a laptop with Ethernet and USB. What’s a standard way to communicate with a device like this? I want to be able to navigate the file system using bash and download C++ code and libraries to run on it. I know there is some form of Linux on it.

submitted by /u/TheSkyPirate
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