If you need to use custom fonts, it is very easy to do it on Attesa Theme using the free plugin called Custom Fonts.
First of all, install and activate Custom Fonts plugin on your WordPress site.
Then go to “Appearance-> Custom Fonts” to upload your custom fonts.
After uploading your custom fonts, go to “Appearance-> Customize-> Attesa Theme Options-> Typography Settings“.
Check the option called “Disable Google Fonts and use standard/custom fonts” so that the default fonts are shown together with the custom fonts.
Custom fonts will be present in the list together with the default fonts (at the bottom of the list).