How to parse websites in JS?

Question

JavaScript

Good afternoon!

I don't understand this topic very well.
Lots of information and I'm completely confused. Let's say I want to get the exchange rates for today.
From this page:
https://www.cbr.ru/scripts/XML_daily.asp
Or from this page:
https://www.cbr.ru/currency_base/daily/
What should I do? In some sources, I saw information that such pages are downloaded, and then something is done with them. Really, in order to get a couple of lines of information, you need to download a page of a website?
In general, how do I form a request to the page?

Answer 1

Hold