You need to know how to make sharp edges. Which rocks are suitable? How to keep them sharp?
You need to cut down a suitable tree.
You need to know which tree is even suitable.
You have to figure out that either the chunk of wood should rotate, or the sharp edge rotate around it.
You need to know how to make a center pivot, or spindle to turn the wheel. You need to know that you even need this!
After making the wheel, now you need to make axles and some kind of platform to make it useful.
Before doing all this, you first have to realize that you need a wheel!
There is a long list of basic knowledge needed to invent even the simplest things. Every invention builds on previous knowledge.