I've reviewed the major accounts of the First Vision. There are other accounts, but for the most part, they repeat the accounts I reviewed.
What have I learned from all this? I learned these things are certain.
I learned Joseph thought a lot about the eternities.
I learned there had to be a catalyst that drove him to seek God in prayer.
I learned Joseph experienced something profound in his teenage years. He saw (either physically or in a vision), Jesus or God the Father or an angel or numerous angels or a combination of all of them.
I learned he was forgiven of his sins.
I learned Joseph took his spiritual salvation seriously - he did not leave it to chance or to any other man.
As a reference, I'll include some other summaries of the various accounts of the First Vision. These do a great job listing the different accounts and how they differ.
Comparison of 9 First Vision Accounts
Primary Accounts of Joseph Smith's First Vision of Deity
Comparing Early Accounts of the First Vision