There’s a free template on the Internet. Can I use it to create an HTML template if the actual layout does not belong to me?
No, and 99% likely that if it is a free design then it will not be anywhere near the standards for here
I understand. Where I can read about standards website mockap and HTML template? Can’t find it.
Oh, one more question! Can I buy a PSD template on envato and create an HTML template based on it for sale?
Not without extended licenses, and written approval/agreement with the original author