"Archer's Knot": https://www.youtube.com/watch?v=vXu3NgWHMvA
A really handy knot where the loop stays fixed /w tension on the standing end, and the working end can be cinched to shrink the loop.
Fun fact: this knot seems to be the complement of the Arbor Knot (https://en.wikipedia.org/wiki/Arbor_knot), where standing end tension cinches the loop & the working end doesn't.
Also, handy rope terminology that really helped me out: https://www.ropebook.com/information/knots/terminology/
The social network of the future: No ads, no corporate surveillance, ethical design, and decentralization! Own your data with Mastodon!