These are considered the "core" knots for any outdoorsman or prepper.
For more in-depth study beyond the app, these resources are highly recommended: Mastering Celtic Knots in 3D Design Knots 3D
These are critical for seamanship and are prominently featured in the Sail Ionian guide . These are considered the "core" knots for any
: A friction hitch used in climbing and rescue to ascend a rope. Knots 3D