This post shows how to add line breaks in WordPress.
There are two ways add line breaks. Shift+Enter in visual mode or by adding <br /> in HTML mode.
When you hit Enter on your keyboard, it starts a new paragraph. Shift+Enter will add a line break. See example below
This is paragraph 1
This is paragraph2
This is example of a line break. The different is the space between the text
You can also click on the 3 dots in the block menu and choose Edit HTML. Then add <br /> where you wish to add a line break.