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Support loops are edge loops used to preserve volume of a model when subdivided. There are various ways to add support loops.
In this step-by-step mini-tutorial, I will explain how I use Bevel Modifier to turn a mesh into SubD ready mesh.
Add Bevel, Weld & SubD > Adjustments & minor fixes > Backup & apply modifiers > Minor fixes and enhancements
I will use this sight peep model to demonstrate:
Select > Select Sharp Edges
will give a decent selection to add or remove from.