What are the GDS pins on the IRFP260N? It's better to be more detailed! ~Thank you! ~
Look at the datasheet yourself, in the section on packaging, defined by the pins.
The word is toward you, the pin is down.
From left to right, GDS, also, there are metal ones on the back that are also pins, this one is connected to D. You can measure it with a multimeter in the on/off range, it's also connected together.