To change Metronic's font family please follow below quick steps:

1. Go to Google Fonts and choose your font family.
   
2. In your HTML's head section replace the default font URL with the new one:
   
   
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   <!--begin::Fonts-->
   <link rel="stylesheet" href="https://fonts.googleapis.com/css?family=Poppins:300,400,500,600,700" />
   <!--end::Fonts-->

   
   
3. Go to the custom SASS variables file src/sass/components/_variables.custom.scss and override the default font family to apply the new font family globally:
   
   
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   // Typography
   // Font family
   $font-family-sans-serif: Poppins, Helvetica, "sans-serif";

   
   Poppins is the font family name while Helvetica, "sans-serif" alternative system font familiy names in case the main font name is not available.
   
4. Run Gulp or Webpack build task to compile the changes to the assets folder.