The module is an electronic switch, that allows to switch a higher voltage or lager current from a microcontroller.
This can be used to switch a 12V LED light.
The output pin of the ESP32 (e.g. Pin26) is connected to SIG, VVC is connected to 3.3V, GND to GND.
The power supply of the lamp is connected to VIN (+) and GND (-).
The lamp is connected to V+ (+) and V- (-).