Thank you again ...
problem with Adafruit's guides are that they dont work for NANO (Error compiling for board Arduino Nano.)
problem with MagMaster guides is that for some reason senzor outputs nonchanging value (like i am not moving it)
https://www.instructables.com/Easy-hard-and-soft-iron-magnetometer-calibration/
and problem with any other guide is that it dosnt explain the last step how to get Bias and Matrix into the code itself ...
i gues my best bet is to buy different arduino tomorow.