2. Calibrate the touch screen
Forget about xinput-calibrator and X11 calibration metods.
If you have calibration file(/home/pi/touchscreen_axes_calib) from a previous installation you can use it(put it in /home/pi/).
If you don't, then use the touch screen calibration plugin. This plugin works if you set correctly the Raspberry PI resolution in /boot/config.txt. Follow the steps in this video.