Help me about these codes

Fine, I will follow ALL YOUR DIRECTION CORRECTLY but ANSWER ALL MY QUESTIONS CORRECTLY WITHOUT ANY TRASH TALK.
I know that I am a noob here and I am approach a master or god for help, so please be considerate.

if(Serial.available()>0){
for(i=0; i<0; i++){
RxData[i] = Serial.read();
Serial.print(RxData[i], HEX);
}
}

This only reads the data not storing it, so please kindly help me.