manual/include/creating-location-markers.html

<p>
  <dfn>Location Markers</dfn> appear in the <a href="@@ruler">Locations Markers
  ruler</a> at the top  of the timeline. The green
  <dfn style="background-color:limegreen;">begin</dfn> and
  <dfn style="background-color:limegreen;">end</dfn> markers, that define the length of the session, appear
  automatically, but yellow <span style="background-color:gold;">custom</span> markers can be created at any position in a
  session.
</p>
<p>
  There are multiple ways to create custom markers at the current playhead position:
</p>
<ul>
  <li>using the keyboard shortcut (default is <kbd>Num-&crarr;</kbd>, the <kbd>Enter</kbd> key on the numeric keypad)</li>
  <li>using the <kbd class="menu">Transport &gt; Markers &gt; Add
  Mark from Playhead</kbd> menu.</li>
</ul>

<p>
  Adding a marker at an arbitrary location on the timeline (i.e. not at the playhead
  position) can also be done either by:
</p>
<ul>
  <li><kbd class="mouse">right</kbd> clicking in the Location Marker ruler, and
  selecting <kbd class="menu">New location marker</kbd></li>
  <li>using the <a href="@@the-ranges-and-marks-lists">Ranges &amp; Marks List</a>,
  clicking <kbd class="menu">New Marker</kbd> and using the <a href="@@editing-clocks">
  clock widget</a> to set its position.</li>
</ul>