I have little to no experience in programming and i'm very slowly and gradually getting the hang of it. My next project is that i'm making a clock, and wanted to use multiple functions for the hour:minute:seconds instead of just using one for everything. But after reading some i came to the conclusion that the arduino can only run one function at a time. So my question is how can i make the illusion of multiple functions running simultaneously on a LCD screen.

My Minute() function is as follows: void Minute(){

  for(Second_Digit; Second_Digit<10; Second_Digit++){
    if(Second_Digit==10){
      First_Digit = First_Digit + 1;
      lcd.print(First_Digit);
      }
    lcd.setCursor(3, 0);
    lcd.print(First_Digit);
    lcd.setCursor(4, 0);
    lcd.print(Second_Digit);
    delay(60000);
    lcd.clear();
    
    if(First_Digit==5 && Second_Digit==9){
      First_Digit = First_Digit - 5;
      Second_Digit = Second_Digit -10;
      lcd.print(First_Digit);
      
      }
    if(Second_Digit==9){
      First_Digit = First_Digit + 1;
      lcd.print(First_Digit);
      Second_Digit = Second_Digit - 10;
      }
    
  }
}

And my Second():

void Second(){


  for(Second_Digit; Second_Digit<10; Second_Digit++){
    if(Second_Digit==10){
      First_Digit = First_Digit + 1;
      }
      
    lcd.setCursor(0, 0);
    lcd.print(First_Digit);
    lcd.setCursor(1, 0);
    lcd.print(Second_Digit);
    delay(1000);
    lcd.clear();
    
    if(First_Digit==5 && Second_Digit==9){
      First_Digit = First_Digit - 5;
      Second_Digit = Second_Digit -10;
      
      }
    if(Second_Digit==9){
      First_Digit = First_Digit + 1;
      Second_Digit = Second_Digit - 10;
      }
    
  }
}

And the setup and loop are very simple:

void setup()
{
 lcd.begin(16, 2);
}
  
void loop()
{
  Second();
  Minute();
}

I know i can't use delay() and have no idea how to tackle this another way.