How to understand coordinates in HTML 5?please answer fast.

Answer 1

may be this helps you
https://code.sololearn.com/W8hasCeVMxD0/?ref=app
or visit sololearn official course
https://www.sololearn.com/learn/HTML/2213/

Answer 2

But in blank page how will i understand that which coordinate is where? And how will i fill the coordinates in tag?