In template demo we used Google Font named: Source Sans Pro for site typography and Playfair Display for H1..h6 Headers.
Check template Typography tab inside template settings, of course you can set your own font-family. More information about Typography you can find >> here <<. Remember that not all Google Fonts support multiple scripts (like Latin, Cyrillic, and Greek for example). Use them if you need to use diacritical marks/chars, native language letters.