What is the difference between headers and headings?

Answer 1

There are huge difference between them. If you have completed HTML there will be no question like that.
Heading are used to add the deadline to your document. And 6 headings have different 6 sizes.

Answer 2

The head tag is used for holding Meta information, title, links, etc. and is not displayed on the page. The header tag is used within the body of the website and can be used multiple times if required, e.g. to determine the top of an article.

Answer 3

header is a semantic tag it is use to make your code more understable.it is just like div .
it has not its own effects.
usually we put nav and headings in header.

heading tags <h*> is used to describe any important text of the page . it has its own effect .it increases the font size & weight of text.