What are the things to do once the engine remap is done?

For petrol engines, always drive with min 98 octane gas. For turbocharged engines, always heat up engines for at least 10Km to allow it to reach its operating conditions before driving hard with them (when the water temperature is Ok, that does not mean the oil temperature is there yet !!!!), and before shutting down the engine, make sure you keep the engine idling for at least 30 seconds to make sure the turbo is not spinning any longer. A turbo can spin at speeds of up to 200.000 RPMs. Once you stop asking for high boost, the turbo does not stop spinning right away as there is certain inertia. You want to make sure the turbo still receives proper lubrication in that phase (when you shut down the engine lubrication stops) to avoid turbo failure.