COM3 not working

Using Arduino Installation & Troubleshooting
#1

it shows this whenever i use it:
⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮ɩ⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮ɩ⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮ɩ⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮
on any project with serial monitor.
can some one explain?
im mad
maybe try on your board.
link to project:http://www.circuitbasics.com/arduino-ir-remote-receiver-tutorial/
heres the code:

#include <IRremote.h>

const int RECV_PIN = 7;
IRrecv irrecv(RECV_PIN);
decode_results results;

void setup(){
  Serial.begin(9600);
  irrecv.enableIRIn();
  irrecv.blink13(true);
}

void loop(){
  if (irrecv.decode(&results)){
        Serial.println(results.value, HEX);
        irrecv.resume();
  }
}
#2

Nonsense characters printed to serial indicates a baud rate mismatch. Do you have your serial monitor set to the same baud rate as your sketch?

What board is it?

#3