I think what Perpich means by that is…

To become confident, be cautious, be safe in new situations.

Take care of yourself.

It will help Brian think about what he do to survive.

Try to think what the importance of staying ahead of things.

Perpich is trying to motivate him in his mind, making Brian think positive.

Perpich helped Brian to make a fire.

Perpich made Brian find food.

Brian did a lot by being positive.