Using google font on any webpage is very easy and you can load the fonts asynchronously.
If you don't use the direct code that Google font delivers and you simply load the following url:
You'd be represented the source code (CSS).
Now, copy and paste the displayed code in the CSS source of your website.
You can then use your selected google font(s) on your webpages using the following:
body
{
background-color: #F1F1F2;
font-family: 'Open Sans', Arial;
}
That's enough and it will work.