Using Oxygen: Tips
Oxygen has default shortcuts established to simply markup. You can view these or modify them here:
Options → Preferences + Menu Shortcut Keys.
Control + E:
Short cut for tagging a chunk of content. For example, a paragraph from a book or a poem:

<lg>
How soon go by the swift-winged years
How soon comes our three score and ten;
Our lives are mixed with joys and tears,
Sad disappointments, dead hopes, fears,
And sighing o'er what might have been.
</lg>

<lg>
<l>How soon go by the swift-winged years</l>
<li>How soon comes our three score and ten;</l>
<li>Our lives are mixed with joys and tears,</l>
<li>Sad disappointments, dead hopes, fears,</l>
<li>And sighing o'er what might have been.</l>
</lg>
Control + slash
:
Short cut for tagging repetitive chunks of content.