For Part I please refer link
Part II – please refer link
One we have referenced / loaded JQuery (as mentioned in Part II) either using a local copy or CDN, the next thing is to start using JQuery.
the most important function of jQuery that is used a lot and we all would be using is the .ready() function.
the syntax for writing JQuery is either using the JQuery keyword or the alias ‘$’, so here’s the example.
jQuery(document).ready() or $(document).ready()