The single most valuable thing I learned is what is really possible to do. I got to see that because I ended up helping people of means who took me aside and showed me a look outside the place I was living.
For many, and this is true of my peer group, just knowing what is possible really mattered.
Of course I left town, found work and married someone I thought highly of and got to work building a better life.
Your son can do that too. Make sure he knows it.