How to add Google fonts to WordPress themes

// Google Font Function
/**
	//Using a single key and value:
	<add_query_arg( 'key', 'value', 'http://example.com' );
	
	//Using an associative array:
	add_query_arg( array(
	    'key1' => 'value1',
	    'key2' => 'value2',
	), 'http://example.com' );
*/
	function university_google_fonts_url() {

		$fonts_url = '';

		$Montserrat 	= _x( 'on', 'Playfair Display font: on or off', 'university' );
		$open_sans 		= _x( 'on', 'Open Sans font: on or off', 'university' );

		if ( 'off' !== $Montserrat || 'off' !== $open_sans ) {
			$font_families = array();

			if ( 'off' !== $Montserrat ) {
				$font_families[] = 'Montserrat:100,200,300,400,500,600,700,800,900';
			}

			if ( 'off' !== $open_sans ) {
				$font_families[] = 'Open Sans:400,700,900';
			}

			$query_args = array(
				'family' => urlencode( implode( '|', $font_families ) ),
				'subset' => urlencode( 'latin,latin-ext' ),
			);

			$fonts_url = add_query_arg( $query_args, '//fonts.googleapis.com/css' );
		}

		return esc_url_raw( $fonts_url );
	}




	function fictional_university(){
  
  //Normal Way
		wp_enqueue_style( 'google-fonts', '//fonts.googleapis.com/css2?family=Open+Sans:ital,wght@0,400;0,700;1,400;1,700&display=swap', false );
    
    Themeforest Themes
		wp_enqueue_style( 'university-google-fonts', university_google_fonts_url(), array(), '1.0.0' );

	}
	add_action( 'wp_enqueue_scripts', 'fictional_university' );