Use your titles as headlines

Your titles should be like newspaper headlines; giving a super brief summary of the article and telling the reader whether they want to read any more.

Use section headers as summaries

Exactly the same goes for section headers inside longer articles, they should be brief summaries of the section they head.

Not only does this help the reader to scan the text to gain an overview and decide which parts to read in greater detail, knowing the conclusion of a paragraph at the outset makes it easier to understand.

Albert et. al. use this to great effect in their classic Molecular biology of the Cell.