serial communication between two arduinos

Using Arduino Project Guidance
1

Hey, i am trying to send a string from one Arduino Mega to another Arduino Mega.
The connected Pins:
Pin 19 RX1 to pin 18TX1
Pin18TX1 to Pin 19 RX1

The code from the sender:

char mystr[3] = "Hello"; //String data

void setup() {
  // Begin the Serial at 9600 Baud
  Serial1.begin(9600);
  
}

void loop() {
  Serial1.write(mystr,5); //Write the serial data
  delay(1000);
}

The code from the receiver:

char mystr[5]; //Initialized variable to store recieved data

void setup() {
  // Begin the Serial at 9600 Baud
  Serial.begin(9600);
  Serial1.begin(9600);
}

void loop() {
  Serial1.readBytes(mystr,5); //Read the serial data and store in var
  delay(1000);
}

My receiver doesn't display the string from the Sender Arduino.
Do you guys see where the problem could be?

2

in the receiver you read the data from Serial1 but don't wrrte it to Serial

3

What did the compiler say about this?
char mystr[3] = "Hello"; //String data

Serial1.readBytes(mystr,5);
Then what?

4

Take a look at this post Serial Input Basics - updated - Introductory Tutorials - Arduino Forum

Robin does a great job explaining serial communication. I followed his instructions and it worked great for me.