I'm just starting JS/jQuery and i got a first question i'm not able to answer myself : is the code from a .js script executed when i call it from a HTML file ? 

I thought so, but why in this example, there is nothing in the console ? (chrome dev debug)

In my Index : 

<link rel="stylesheet" href="https://ajax.googleapis.com/ajax/libs/jquery/2.2.0/jquery.min.js">

<link rel="stylesheet" href="./main.js">

my js file : 

$(function(){

  console.log("Debug Message");

});

I can see that the main.js is correctly called in the console.
But i see no console.log in the console.

Why is that ? 

Thanks a lot ! :)