Add a link to previous page/home on template

Would there be a way to add a “return to homepage” link on template?

I am talking specifically about links that follow from my home page which are portfolio tag links. For example, if you click on the image labeled “lofts” you go to a gallery which displays all portfolio items tagged lofts. How would I insert a “back to home page” link on this particular page/template?

Hope that’s clear.

Rita