Dont I need to use character.value instead ?

character is the value in this instance. He takes the array of characters and uses the forEach() array method. It takes the placeholder variable of character (singular) which is the current iteration of the loop through all the characters. So in human words it is for each character in characters ... do this (code) and the character variable is available each time.

Hamzah Iqbal in this specific case

character refers to each individual letter in the array

//characters array
['A','B','C',....]
//array[0] = 1 character 'A'

so your first iteration of characters.forEach loops over the entire characters array. And each iteration it checks the character variable. So loop one character will be 'A' loop 2 it will be 'B' and so on. So it keeps running until and adds each letter to the new array except as per the condition letter 'L'

To make this less confusing you can change the word character to letter

characters.forEach(letter => {
   if(letter !== 'L'){
      noel.push(letter);
   }
});