Question

I read that if you do this, you can avoid conflicts with other libraries that use $ symbol.

(function($) {
  // jQuery code  
})(jQuery)

Could someone explain it to me, please?

Answer 1

You define an anonymous function with an argument named $. Then you call it immediately thereafter with the jQuery object (whose name is more than likely explicit enough to not collide with some other library object’s name).

Thus within the scope of the anonymous function (where all your jQuery code will be), $ will refer to the jQuery object. And hence everyone is happy: your code gets to use the convenient shorthand $ and code later on can use $ for their own business.