* Paragraphs: The first line of each paragraph is typically indented. The amount of indentation varies depending on the style guide (e.g., AP Style, Chicago Manual of Style). It's usually around 0.5 inches or one tab.
* Lists (Bulleted or Numbered): Items in lists are often indented to visually separate them from the surrounding text.
* Block Quotes: Long quotations are typically indented to set them apart from the main body of text.
While there might be other niche uses of indentation in specific types of articles, these are the most common. The consistent use of indentation improves readability and overall presentation of the article.