Start your headers with H2, then H3 and so on. H1 is reserved for the domain name. 

Line breaks vs paragraph breaks

  • To make a line break (one line just below another), use shift+return 
  • To make a paragraph break (with a space between each paragraph), use two returns

Learn more in this article.

Nonbreaking spaces

Insert a non-breaking space between words that should never have a line break between them. Wordpress will break the line around other words instead.

  • Use CTRL+Space in the Visual editor or   in the Text editor

Learn more in this article.