Connect two computers

I have an HP desktop and an Acer laptop I want to connect together. Please, the easiest, cheapest way. Maybe serial or USB cable.
 
The problem with the above answers is YOU HAVE TO CONFIGURE TCP FOR YOURSELF.

As long as you only want ComputerA <--> ComputerB and neither to have Internet access, you do not need an ISP connection. You apparently do as you are accessing Techspot.

Your ISP connection has a Modem and it may have an internal router.
  • isp === modem/router --- PC
If there are more than one slot for the PC(s) to use, just connection the second system to the ISP device.
If there is only one slot, then you need:
  • isp === modem/router --- switch --- multiple PCs
Before we make assumptions, please tell us the Make/Model of the device connected to your ISP.
 
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