Programming software for automatic copy and paste?

I would like to have software with which I can save / download the answers to the respective questions on specific topics from another website, as a PDF or something similar, for my laptop, PC and / or mobile phone. How do I program that?

Which programming language should I use?

How do I proceed?

What is important to note?

Or is there already a software with which you can do that?

The way you imagine it won't work. It's way too complicated. You can't write an algorithm that you ask a question and that perfectly gives you the respective answers from any website on the Internet

So, first of all it is necessary to "remote control" a web browser.
This works with almost every language. (Java, C #, …)
Since I also download things from the web, I first remotely controlled Internet Explorer (see my answer to Girlfriend)
Unfortunately, websites do not support IE anymore (completely) and so I switched to the Selenium Driver (freeware).
You can also integrate it in Excel (see Youtubes) and then start remote control via VBA and call up any page (also start Google) and load the desired content into Excel and save it as a PDF from there.
From my point of view, this is an easy way of doing this.
I already knew VBA. The program for this purpose then lasted ~ 1 day.
There are many solutions on the web. Copying these together for your own purpose saves a lot of time.