Is JS that simple, or?

HI,

SO while I'm new to JS, and while i struggle with it, I know that with practice eventually I will understand it fully, and the documentation.

So far, with the documentation, I came across interesting things.

E.g.

  window.addEventListener("load", function(event) {
    console.log("All resources finished loading!");
  });

So, we can use this 'load' function to make an animation e.g. a circle that loads, or a bar, while the 'heavy' page loads, like we see soemtimes on e-commerce sites right? So now we need to write, show this that will increase a % of the site is loaded.

And then there is another function or method whatever it's called, that will e.g.

if the user is scrolling, then do this.

Etc..

Making a gallery? well, we need to get the lenght of the images, so we select all of the gallery itme, with a query selector and class here, and we count the lenght of it, and if it reaches the last item, then back to one and start again.

It goes along those lines right? I just need to get to know documentation better, and how the syntax works, and Id' be fine right, it might take few weeks tog et used to it, but it's not really that hard if we think about it, is it? I can be calm and be sure I can learn this in a month, the basic fundamentals doing stuff like modlas and so on.