Question

what is the difference between BG colour and background attributes of the body tag

Answer 1

Bg color, changes the background colour of the web page
Background, inserts image as background
Hope it helps you

Answer 2

$\bold{\huge{\purple{\underline{\mathcal{\star\:Hello\:Dude\:\star}}}}}$

BGColor attribute of body tag is used to specify the background color of a HTML Document.

WHEREAS

Background attribute is used to add Image in the background.
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$\bold{\large{\purple{\underline{\mathcal{\star\:Hope \:it Helps\:\star}}}}}$