Headings
Use a Title block for section headings and subheadings. You can choose H1–H6 appearance, which also helps search engines understand the page structure. As a rule, keep one H1 per page; it is usually the main heading at the top. If the first line of a Rich text block is really a heading, use Convert… to turn it into a Title block.
Paste text from elsewhere
When you paste from Word, Google Docs or another website, the editor cleans the formatting. It keeps useful structure such as bold, italics, links and lists, while removing outside fonts, colours and styles. The pasted copy therefore follows your website's own design.