Linking two HTML sites

I have my index which loads main home page.

Have an FAQ site that is very similar to the Index, with different content.

Footer should have a link to redirect to FAQ.

Where do I place faq.html? partials, content?
How would I link from the footer? ref, relref?

Just create a /faq section or a page.

Link with relURLĀ“ orabsURL`. Please read the docs for further info.