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.
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