What accessories needed to connect laptop with 2 monitors?

I have an Ultrabook with HDMI connection. Unfortunately, the display is very small (13 inches) so I got 2 used monitors to map my laptop on both monitors and work better. https://www.lg.com/...W2442PE-SF is the monitor.

My laptop I can with a monitor over a HDMI cable easily connect the, how can I get it, but my desktop display on both monitors so what cable or accessories would I still get?

It depends on the laptop, there are USB docking stations and USB-C (Thunderbolt) docking stations where you can connect i.d.R 2-3 monitors

I use e.g. https://www.lenovo.com/...SA_Generic

There are adapters for that. In principle, you can connect the other screen to any USB port - if you have the right adapter. When you talk about an Ultrabook, I think that it has at least one USB-C or at worst a USB 3.0 port. A 13-inch device will also have correspondingly fewer connections.

If I were you, I'd buy a matching adapter with USB and display jacks. Something like: https://www.amazon.de/...07VQ4LSC6/

If you just want to duplicate your desktop, so you just want to have the same screen 3 times, then it does an HDMI splitter too. But then you have the same picture on both screens - no independent desktops just lying next to each other. That would be a little cheaper. Something like that: https://www.amazon.de/...07DW2445X/