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Do you use any other knots than the 8 knot for climbing?
Can't comment for parent, but I agree. As a climber I only know a couple of knots, and don't usually need anything outside this set, in order of utility:

- figure 8 - clove hitch - klemheist - overhand bend - girth hitch - munter hitch - prussik - ring bend - double fishermans - bowline

This is a good selection of climbing knots.

I went down a rabbit hole recently surveying the "current internet wisdom" regarding the use of the double bowline with fisherman as a tie in knot for the climber ...

To recap briefly -- figure 8 follow through is the standard tie in knot that everyone is taught. It's easy to tie, easy to verify visually, and secure -- but it's hard to untie after being weighted by a fall.

That last fact matters a lot when sport climbing when taking big falls a lot is expected. Hence the several different versions of the bowline ... which is also secure if tied properly, easier to tie wrong, harder to verify visually, but extremely easy to untie after weighting ... Unfortunately there's a bit of a controversy in the climbing world regarding "what people are likely to do wrong" and whether those kinds of risks should guide people towards not using the double bowline as a tie in ... there are also multiple variations of the bowline -- some of which actually are less secure ...

Personally I've been using the double bowline with a fisherman finishing knot for years now when sport climbing -- but it's a bitch to say it ... -- but I think a worthy addition to your list (or at least a clarification that the regular bowline by itself is not really used for anything in climbing)

Apparently there is a wrong way of tying a figure 8, that leads to a version that is much harder to untie. Personally I've never had issues untying a figure 8, so it might just be that my default way of tying it happened to be the correct way.

It's described in this video: https://www.youtube.com/watch?v=QAr-uHd8h8o Skip to 13:20 for the interesting part.

That's a very interesting and well-done experiment! I definitely learned something -- and I buy the argument that there is a way to tie a figure 8 that makes it less likely or significantly less likely to be difficult to untie ...

But I think that as rope wears and as humidity goes up -- you'll still easily find situations where the knot was correctly tied but still a lot of effort to untie after load ...

And 12-18 seconds to untie is still a lot more time required than untie'ing the double bowline ... And he's showing figure 8 on a bite so he doesn't have to take the extra seconds to undo the figure 8 after ... that's not a huge deal but the double bowline is still imo easier to tie, faster to tie, and faster/more ergonomic to untie -- and also of course, harder to verify that it was tied safely by visual inspection ...

Just curious, why is the clove hitch so high on the list.

I hate that knot, and never understood its widespread popularity. It tends to jam and slip. I guess that there are cases where these combined properties are useful, for example if you want to make things adjustable, but most of the times, I just find it unsafe and hard to control.

I did a bit of sailing and while the clove hitch was taught early, we almost never used it. I'd say the most useful list include, from memory: bowline - figure 8 - two half hitches - cleat hitch - reef knot, and of course, proper coiling.

About the reef knot. It is also called the square knot, and it should be used only when appropriate (ex: on reefing), it can be dangerous when misused.

I also tried a more... adult kind of knot tying and the clove hitch is generally a bad idea.

In multipitch climbing the clove hitch is used to attach yourself to every belay. In this situation adjustment is useful. It usually only holds body weight, and it's always tied in a carabiner, so you can slide the carabiner out instead of untying. It doesn't slip with climbing ropes either. So it's perfect for climbing.
This.

It's what I use between my harness and the anchor to tie myself to the belay

I have used it with, say, guy lines on a tent, and it is finicky there, or around a tree... but with a 9mm climbing rope and a carabiner it's quite good.

It's easy to inspect, it is easy to tell if you've tied a girth or munter hitch on accident, and it's easy to untie by removing the carabiner.

Best of all, it's very easy to adjust without fully undoing the knot, and so you can change the length of the tether quickly.

I was taught to use the clove hitch as a fast and easy to check way to secure something, typically for a backup to a primary anchor or knot. Like once you get up to the top and are anchoring in you can throw a quick clove hitch on as a backup while you get a stronger anchor setup. We also used it in crevasse rescue situations as a backup for the prusik/friction hitch.
That prussik might save your life, that's for sure:)
You will almost certainly want to know the butterfly knot and a number of hitches and bends: https://www.animatedknots.com/climbing-knots