"If you want to echo a number you do not need the quotations, because it is an integer". Well as you mentioned the quotations dignify a string, correct? Ok well if you wanted to echo a string output you could still put your "Integers" (numbers) in a string format. The only logical reason you would not want to use the quotes are if you are doing this.

PHP Code:
//#CLIENTSIDE
function onCreated()  {
    echo(
10 * 20 / 1);
} 
or for a timer
PHP Code:
setTimer(0.05) 
It's just good to explain it in a way that does not make it seem that you cant simply do,

PHP Code:
echo("10, 20, 50"); 
Because you defiantly can.

Anyhow the quality of the video has improved mildly, and the formatting and explanations that you gave were excellent, I enjoyed watching and can see this being useful to beginners , Thanks for your help in the community and good job :=)

-Noof