As you discovered you need two Mac systems which share a common interface standard: FireWire or Thunderbolt and be running OS-X/macOS which it sounds like you have a Windows laptop PC not a Mac laptop. [https://computers.tutsplus.com/tutorials/understanding-the-applications-for-target-disk-mode--mac-60609|Understanding the Applications for Target Disk Mode]
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As you discovered you need two Mac systems which share a common interface standard: FireWire or Thunderbolt and be running OS-X/macOS which it sounds like you have a Windows laptop PC not a Mac laptop. [link|https://computers.tutsplus.com/tutorials/understanding-the-applications-for-target-disk-mode--mac-60609|Understanding the Applications for Target Disk Mode]
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Screen sharing is the next possible option but that too requires both systems having the same OS Local to Local or a service like Zoom which you need access to the internet to their server by both systems, which again is not really possible here.
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Screen sharing is the next possible option but that too requires both systems having the same OS and a local network or a service like Zoom which you need access to the internet to their server by both systems, which again is not really possible here.
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That leaves the last possible way which I doubt you'll do as it requires you wipe your systems drives and install Linux and then though the Ethernet connection run a Linux application that allows you to share the screen [https://help.ubuntu.com/stable/ubuntu-help/sharing-desktop.html|Share your desktop]
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That leaves the last possible way which I doubt you'll do as it requires you wipe your systems drives and install Linux and then though the Ethernet connection run a Linux application that allows you to share the screen [link|https://help.ubuntu.com/stable/ubuntu-help/sharing-desktop.html|Share your desktop]
But that defeats using your two systems as they are now with OX-X/macOS and MS Windows.
At this point I think the smarter direction is just getting an external display it will be the most useful as you can get then needed connections to use it with either system. No alterations to your systems and will be the cheapest way if you can get a used unit.
As you discovered you need two Mac systems which share a common interface standard: FireWire or Thunderbolt and be running OS-X/macOS which it sounds like you have a Windows laptop PC not a Mac laptop. [https://computers.tutsplus.com/tutorials/understanding-the-applications-for-target-disk-mode--mac-60609|Understanding the Applications for Target Disk Mode]
Screen sharing is the next possible option but that too requires both systems having the same OS Local to Local or a service like Zoom which you need access to the internet to their server by both systems, which again is not really possible here.
That leaves the last possible way which I doubt you'll do as it requires you wipe your systems drives and install Linux and then though the Ethernet connection run a Linux application that allows you to share the screen [https://help.ubuntu.com/stable/ubuntu-help/sharing-desktop.html|Share your desktop]
But that defeats using your two systems as they are now with OX-X/macOS and MS Windows.
At this point I think the smarter direction is just getting an external display it will be the most useful as you can get then needed connections to use it with either system. No alterations to your systems and will be the cheapest way if you can get a used unit.