I have raised animals apart from their kind from birth. They know instinctively how to do things that cannot be taught or learned. How can two spiders for example know how to spin a web without every learning from another being?
Once upon a time there was a bug that had a little sticky bit on it's butt, it had a billion descendants when one of them randomly had a gene that affected it's behavior such that it, I don't know, rested on high surfaces using the sticky bit and was safer from predators or something, and then had slightly more kids than the rest. And one of those kids randomly had a gene that gave it more sticky stuff, and one of it's kids used it a little more effectively, and so on and so forth. And that probably takes somewhere from tens of thousands to a few million years.
That's not meant to be literal, but that's the story in my head, and it doesn't feel like a huge leap to get to complex behaviors like webs.
A column of rock erodes, and a piece falls. The piece did not learn to fall. It just _did_, subject to the rules that governed the process of its creation (different meaning) and its environment.