How to include jQuery from a website

Question

And what is the main use of
Var variablename = [];
And
Car variablename = true;

Answer 1

https://www.sololearn.com/learn/jQuery/2785/

Answer 2

<script src = "https://ajax.googleapis.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script> is the cdn for linking 3.2.1 version of jquery.

Var name = [] is making a variable that is holding an array. Example: [ 1 ,4, 9 ] or ['Bob', 'Jill']. You can put data inside it basically.

The second one is making a boolean value. Basically just a way to keep track if something happens. Example: var isLogedIn = true, var isAPotato = false.