How to fix “Eliminate render-blocking JavaScript and CSS in above-the-fold content” in joomla

Question

have a Joomla website that I wish to make faster, following the indications given by GoogleSpeed Insight page: "Resources are blocking the first paint of your page. Consider delivering critical JS/CSS inline and deferring all non-critical JS/styles." see also: google insight

The goal is to separate the critical resources from the ones that can be deferred, and eliminate the unused code, to speed up the loading of a web page.

I have issue here font here

I cant figure it out what should I do. its fonts