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Knowing common knots is not just useful because they are handy, but they also represent a common toolkit - when sailing with someone, if I see they tie a certain thing with a specific knot, I can do likewise. When I see a knot I recognise, I immediately know how to untie and re-tie it.
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Generally the same point about having a common vocabulary in tech work. Sometimes it's about stuff that's obvious to both parties in one way or another - but the name is what ties it together (heh).
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I overuse the bowline. Never seizes, and it can be tied with one hand around your body (or anything else) very quickly.

I think that method was originally taught to me in scouts as an emergency body lift thing, though it would not actually be ideal for that.

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The bowline works well in rope that isn't too stiff, but in kernmantle rope it can self-upset, which is why climbers long ago standardized on the double figure-eight loop for tie-in.
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Tying a bowline is one of my fidgets. Also famously has a part in Jaws (1975), though not mentioned by name. ("Hey! I got it!")
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I’d add tautline hitch, great to have an adjustable-but-holds-well knot to the repertoire!
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Taut line is great, but I'm finding the Farrimond friction hitch is much more secure, and is already on a bite for quick release as an added bonus.
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The bowline is great because you can tie it one handed.
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And figure 8 retrace, a staple climbing knot
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I used to use that a lot, but now would favour bowline, for ease of tying and untying. Less beginner-friendly, though.
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Bowline isn't great for safety-critical applications, especially when not under constant load.
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