Put all of my money into the SP500, this last year did well but I don't know how to diversify.

Last year I put a fair sum of money into the SP500, VFIAX to be exact. I've had nothing but great returns but I really take no credit for it. I picked the easiest, most common stock (at least in terms of advice I had been given) went all in and waited. What else was I to do, just let it sit in my bank account? I received the money from the death of a parent, I didn't earn this so I am extremely careful. I don't try anything crazy or attempt to make huge gains. I realized that this money can...

Put all of my money into the SP500, this last year did well but I don't know how to diversify.

from Put all of my money into the SP500, this last year did well but I don't know how to diversify.