Turn the printer off and and then on.

Run the "Selftest" in calibration settings.

If errors occur during selftest, please fix them before going further.

In Settings -> Temperature -> Fan speed set the value at 130 if you print lots of PETG and 255 if you print lots of PLA. For other materials select a value suitable for your most used filament.

Run PID calibration in calibration settings.

Choose a temperature that matches your most used printing temperature.