Those four things are:
- The shape of objects around our environment.
We do this by touching those objects with out finger prints. It help us re-identify those objects when we encounter them again.
- Different type of sensations such as tickles, pain, heat, cold, etc
We learn this after touching various objects that we haven't been encountered before. Such as fur, fire, ice, etc.
- Knowledge regarding things that dangerous to us.
- Knowledge regarding things that we can utilize to help our survival.
After knowing what objects/organisms in our environment can do to us, we will start to separate the things that are dangerous to us and the things that can be useful to us. For example, we will learn to not touch fire due to the burning sensation and learn to utilize soft objects as cover for our bed.