Is there any circumstance where you can put edgeloops on an N-gon?
https://blender.stackexchange.com/questions/3607/what-exactly-does-edge-loop-selection-do
There is a link to the wiki,
https://archive.blender.org/wiki/index.php/Doc:2.4/Manual/Modeling/Meshes/Selecting/Edges/
EDIT: If you want to subdivide the polygon or put a cut through it, you can select the edges that you want the cut through and [right click > subdivide].
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