Location of function GettingStartedScenario

[hosseinihalimeh]

According to the link below, can you help me in which file should I put this code?
https://plexe.car2x.org/tutorial/example7/

void GettingStartedScenario::handleMessage(cMessage* msg)
{
if (msg == startBraking) {
// Increase CACC Constant Spacing (set it to 15m)
plexeTraciVehicle->setCACCConstantSpacing(15.0);
traciVehicle->setColor(TraCIColor(100, 100, 100, 255));
// then start checking when we reach that 15m distance
scheduleAt(simTime() + 0.1, checkDistance);
@michele-segata
Hello
Do you know a YouTube channel or website for education that you can recommend to me?
Thank you very much