Comments inside codes

When I am coding a template, specially if I want to make it for someone else I usually add notes, because I want people who are not that experienced with coding to understand what they have to do. So the way to add comments in different files it:
For .CSS files

/* Your Comment Here */

For .PHP or .HTML files

<!-- Your Comment Here -->

Inside PHP Codes

<? php; // Your comment goes here !!Attention – only one line of text goes here
?>

or

<? php; /* This is how you insert multiple
lines comments */
?>

And this is all. Now if you ever want to leave comments in your coding, this is the way you do it.