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How to access the child element

I have been trying a lot to focus the lightning-input. But I am not getting how to focus the childElement.
The element which I would like to focus is child Element of parentIn. But when I tried to getElementByclassname I am getting undefined , thinking it cant be accessed like that.
How to access the class which is pointed in the image using JS. I tried but getting undefined
Here is how I tried.
let taggingModal = document.getElementById('globalTaggerId').children;
I am not getting how to move further. Please help me to get through this.

you can try
let taggingModal = document.getElementById('globalTaggerId');
taggingModal.getElementsByClassName("parentIn")[0].focus();

How to get the style properties of the variable in which you are storing text

tag for text area used
<textarea id="tag_text"></textarea>
I am using the following code to store the the content of text area.
var texAreaContent = document.getElementById("tag_text");
Now what code should I use to retrieve the style of every word of the text area content. Please provide the code in JavaScript and please provide a better way if you know because I am at a beginner level

I didn't get what's your problem.
i tried this in my way of understanding of your problem. Check this.
var texAreaContent = document.getElementById("tag_text");
texAreaContent.style.color="blue";
<textarea id="tag_text">Test</textarea>

With jQuery, you can do this like this
$("element").prop('tag_name')
You can change style of an element like this
$("element").css('background', 'lime')

Change getElementsByClassName()[i] field

I'm doing kinda learning by doing JavaScript right know, but I have a problem, where I can not find the solution on stackoverflow. I want to replace a String on a webpage, where I just have the class, but not the ID.
document.getElementsByClassName('ep_price')[0]="FOO"
This should change the defined elemet to FOO, but it does not do that and I have no idea why not...
I have read that I should use .value, but this var is not even defined...
See Screenshot of my Chrome console below:

You need to use .textContent property if you intended to change the text.
document.getElementsByClassName('ep_price')[0].textContent ="FOO"

Quick tumblr boo-lean + Getting text function

James here. Quick, and simple question for you guys. I'm working with a tumblr theme which uses a text option, which means the user can type whatever they want, and it'll display on the blog. The text options however do not work with javascript, so I can't use the text option for amount of columns and the text option for spacing between posts in my script that organizes the whole page. I know there is a way, but I don't know how to do this, to just create an invisible div with the boo lean text in it, and then use jQuery to get the text inside the div to use as a variable? I was thinking like .text(); or .html(); but I have no clue. Any codes or help would be greatly appreciated. I'm new at this jquery thing, so it'd mean a lot.
EDIT: If this is confusing for anyone, I basically need to use jQuery to get text inside an invisible element and use that text as a variable.

I'm not sure what you mean by 'boolean' here, but per your edit you want:
$('#id-of-element').text()
if you only want the text in the div or,
$('#id-of-element').html()
if you want the HTML. So if the div contains:
<h1>foo</h1>,
text() will give you "foo", while html() will give you "<h1>foo</h1>".

Copying text from an element in jquery and inseting into another elelement

I am trying to create a simple js script that will copy text from a specified div element and paste it into the 'value' field of a form. This is the best I have managed to come up with:
var txt=$('div').clone();
$('#name').val(txt);
Can somebody please let me know where I am going wrong?
Thanks guys!

var txt=$('div .someclassname').text();
or var txt=$('div #someidname').text();
$('#name').val(txt);
it like that.