
Hey Enzo,
Your snippet won't work as it is, you have to declare the $
and fire your code only when the document is ready as follow:
( function( $ ) {
$( document ).ready( function() {
$( '#toggle' ).click( function() {
$( this ).toggleClass( 'active' );
} );
} );
} )( window.jQuery );
Please make sure to enqueue your JS file properly.
Happy coding,