I've been a big wall rock climber for many years now, and am also on a fire service rope rescue team.. I know more knots than I could begin to count.

We use exclusively the figure 8 follow thru and on a bight, clove hitch, butterfly, water knot, Munter hitch, double fishermans, Prussik, and munter mule knot all for life safety and rescue. Used correctly the clove hitch is an acceptable life safety knot too. I use it frequently in anchors and rigging high up on the wall. I've never seen the use of the double figure 8 personally. The figure 8 is more than strong enough for a 2 person load. It's a good knot but I don't use it. Occasionally I use a self equalizing figure 8.

I never use the fishermans safety knot anymore for anything. Years ago that was the best safety knot to know, but now we use the Yosemite tuck as a safety for a figure 8. It is much simpler, won't come untied and uses less rope

I never use the death knot, aka square knot but can see its usefulness as a utility knot. I just don't use it. Doesn't hold well and is easily tied wrong.

A great utility knot for camping and general utility is the taught line hitch. It works great for tent cords and tensioning a utility line.

I've used my Aztec rig more than once while hunting. Typically to hoist an animal into the bed of the mule, not for rescue.

Dang it JG! Now I am going to have to come take a knot tying class with you.

Here are a few useful knots unmentioned so far.

The taut line hitch is very useful for tent lines, and similar.

Also very helpful are the sheet bend and the better variant the double sheet bend, which are used to tie together two ropes of different diameter.

Appreciate your service! Great listen and reminder to brush up.

I use an app called knots 3d. Has some useful stuff. It was free.

Sheesh. I'm so bad at tying knots I started wearing only slip on boots and invested in ratchet straps