Jump targets

To a heading

[[en/2-formatting/02-structure/headings#Level 3|to the third level]]

to the third level

To a block

A block gets an identifier at the end of the line with ^:

This paragraph has an identifier. ^keypoint
 
[[en/2-formatting/04-links/targets#^keypoint|link to the paragraph]]

This paragraph has an identifier.

link to the paragraph

Within the same page

[[#To a block|back up to the block]]

back up to the block

Block identifiers are stable

A heading changes when it is rephrased, a block identifier does not. For links that are meant to hold, ^identifier is the more reliable choice.