Should you learn every thing you can

I am myself not sure whether should you or not.

There are two cases i can think:

1. When you have a goal.

You are committed to your goal. You single minded work in that direction. then you don't learn every thing that fall your way. To optimize your time and efforts you have to be selective and choose. Soon hopefully chances are that you will find your goal.

2. When you keep on learning whatever falls your way or whatever you can.

You don't have any goal, so overall you may become more informed and smart person.
Someday opportunity come knocking and might have success. Overall chances are that you will have a more broad outlook towards life.