Passing a long cordelette loop around a stout tree and tying off with an overhand knot is an excellent way to make an anchor. However, if you want to use the shelf, you want to think carefully about where it actually is. It may not be where you think.
Climbing tips and navigation resources
The quad anchor — Alpine Savvy
Glossary of climbing terms - Wikiwand
Retreat anchors - sport climbing — Alpine Savvy
Cordelette on a tree: caution on the shelf — Alpine Savvy
How to rig a courtesy anchor — Alpine Savvy
How to rig a courtesy anchor — Alpine Savvy
Tree Anchor with Cordelette
Rock Climbing — Alpine Savvy
Climbing on a chopped rope - lead rope soloing — Alpine Savvy
Cordelette - Connect the ends with an overhand knot — Alpine Savvy
How do you tie your cordelette into a loop? . Cordelette anchors usually start with a tied loop. The two most common knots (ok, technical
The quad anchor — Alpine Savvy