Paragraphs

What is it you want double return to do?
There was a change in WP 5.7 for making empty paragraphs look the same in the editor and front end: https://github.com/WordPress/gutenberg/pull/27995
https://github.com/WordPress/gutenberg/pull/28268

I want two lines of space between the paragraphs. I don’t want one big block of text.

The GitHub site is usually code. Rather than viewing the code, how do I have space between the paragraphs?

Those GitHub pages are not code, but discussion of the issue.
You can make separate paragraphs, which will have space between them (according to your theme styles). There is no need to put empty paragraphs between paragraphs.

Okay, thanks, how do I do that?

I guess I don’t understand the question.
Just write like you normally would and don’t worry about spacing. If you want to style paragraphs to have more space between them, you would add some CSS in Customizer > Additional CSS like p {margin-bottom: 1.5rem} or whatever is needed to override the theme and default styles with the value you want.

I type the link to the product first. Then I hit return twice. I type in the description of the product and hit return twice. I type in the instructions to click on the url to see and buy the product.

The finished version is one paragraph only.

Can you state which editor you are using and which version of WP?
Is this a different interface for entering products (which WP doesn’t have)?
Did this change recently?
(Sorry I didn’t ask sooner, but it seemed like the same issue others were having with WP 5.7.)

5.7; and I don’t know how to find out what editor I’m using.

I type <a href=“https://www.amzn.to/code”> then hit return twice
I type the description and end it with </a> then I hit return twice
I then type instructions for viewing and buying the product in plain text

But the end result is one paragraph only. The url isn’t highlighted.

I’m glad that other people have the same issue though I am not happy about it. If others have the same issue, maybe it’s a WordPress issue and not me.

No, it only sounded like a similar issue. It’s not the same.
The block editor is the default editor in WP 5.7. If you haven’t done anything to change that, then it is the editor you are using.
But it doesn’t get what you want if you type HTML into the visual editing mode. That would be why your URL isn’t working right, and the single paragraph.

From what you describe, you want the entire description linked. You need to use the interface to enter the link and paragraphs, or switch to HTML mode. But it won’t like your HTML.

What interface does it need and how do I get it ? If something doesn’t like that html, what’s the fix for this issue?

Here is documentation about using the editor.

WordPress Block Editor

Thank you. You didn’t respond about the html not being able to be used.

Reading the pages of your link didn’t help me.

I just don’t have the answer yet and my website is broken.

Which plugin are you using for your e-commerce store?

Several. Loginizer, Keep Backups Daily, Classic Editor. The others were removed from the website by the person working on it. I don’t remember what they were but nothing unusual, just the usual recommendations.