Generic objects dataset

Hi everyone, I would like to understand how to add a new class to the yolov5 basic model.
I found a lot about specific dataset and model that recognize a specific type of objects, but I would like to recognize everything (of course where my dataset can).
For example: I would like to recognize smartphone, car,person, computer, street, bottle of water.

It seems that the basic model of yolo can do that with some classes (that for me is ok), but I would like to add one.
There is some tutorial for that? THank you!