How Can I Learn Javascript in Adobe Animate?

[INTRO]

I've been writing codes for a year now, and many people have told me that I'm the worst programmer there is. I know the basics, but somehow I missed some of the fundamentals and the concepts, and now I'm stucked at my game development. I'm using Javascript in Adobe Animate to create a very very tiny game that only involves clicking with mouse.

I followed a tutorial posted in this is site (this one) . I didn't copy the whole thing tho, I just trying to learn the basics and methods he's using. Now, there's a part in that tutorial that explains a bit about prototype. I have no idea what that is, and I just used it ignorantly as a way to bridge one function to another.

[CODES]

I have three scripts thatis distributed in three layers:

function Main(){
	this.Litter = new Litter();
	this.Money = new Money();
	
	litterP = 0;
	moneyP = 0;
	
	createJS.Ticker._addEventListener("tick", this.update.bind(this));
}


Main.prototype.update = function(evt){

	this.litterP=this.Litter.update();
	this.moneyP=this.Money.update();
	console.log("Main::update()");
}

----------------------------

function Money(){
	this._moneyP = 0;
}

Money.prototype.update = function()
{
	return this._moneyP;
}

Money.prototype.getMoneyP = function(){
	this._moneyP=this._moneyP+1;
	exportRoot.money_1.visible=false;
	exportRoot.moneyP_text.text=this._moneyP;
}

exportRoot.money_1.addEventListener("click", Money.prototype.getMoneyP.bind(this));

--------------------------------

function Litter(){
	this._litterP=0;
}

Litter.prototype.update=function()
{
	return this._litterP;

}

Litter.prototype.getLitterP = function(){
		this._litterP=this._litterP_litterP+1;
		exportRoot.lit_1.visible = false;
		
		exportRoot.litterP_text.text=this._litterP;
	
}


exportRoot.lit_1.addEventListener("click", Litter.prototype.getLitterP.bind(this));

[PROBLEMS]

Everytime the instance called "lit_1", the value of litter_1 should be added by 1, and then its value should be printed in a textbox called "litterP_text". When I tried to click, instead of displaying "1", it displays "NaN". It seems like the value of litter_1 is undefined. The same thing happens to the money_1.

How can I solve this?

[QUESTIONS]

1. What is this prototype?
2. How can I access the variables declared on the parent function and access it in the prototype function?
3. As a beginner, where can I learn Javascript in Adobe Animate? (I'm not talking about the documentation that is extremely hard to comprehend. Besides, my first language is not English, so I can't understand those technical languages most of them are using)

[Note]

I've frustrated many people with my code, so before you complain, I would to apologize. Thank you for reading.