Markers can be inserted into the current text via the Set marker button in the toolbar, keyboard shortcut (⇧⌘M) or the menu item Markup > Insert marker. A Marker looks like this: {* MarkPoint *}. A detailed structure of the Marker:
Open: {*
Description text: This can be any word(s)
Close: *}
Markers are particularly useful for templates to be able to quickly select certain text points, or to leave some text in the text for later edits.
When inserting, three different behaviors are possible:
To be able to quickly select markers there are two different keyboard shortcuts. One to select the next marker and one to select the previous marker. The keyboard shortcuts for selecting the markers can be set in the Preferences (More about setting Marker selection).
In addition, the button Marker jump is available in the toolbar. Alternatively, the markers can also be selected via the menu via the entries Markup > Next Marker and Markup > Previous Marker.