Primitive Living Skills

I'm curious as to how many people on here are familiar with any kind of Primitive Survival. Meaning, knowing how to live off of the land with absolutely no modern tools or conveniences, where the only tools you have or need are ones that you create from the land around you. That kind of thing. Is there anyone who is proficient with that skillset here?
Because I am and I know that it is incredibly vauable knowledge to have, especially in a SHTF scenario. But I don't see much discussion on it.