I once read that you can buy a 2 screen for a laptop.
For me that would be very helpful. I wonder if this really exists and if and how expensive.
This is usually not so easy. You need a docking station / USB-C port rep that supports this function. Very few notebooks can do this without tools
The best thing is to get out of my IT experience
the notebook manufacturers Dockings / USB-C Port-Rep's
The best thing here is business devices that can do this from home.
If your laptop has a graphics card connection like DVI / VGA / HDMI then you can take a normal screen
Simply buy a normal screen, provided your laptop has a corresponding connection for it (DVI, VGA or HDMI). Have three notebooks (2 multimedia and a business notebook) in the house from different manufacturers and all three have appropriate connections and it also works perfectly. But as I said, the connections must be available or the possibility to connect a docking station.