What does bryson mean when he refers to shakespeare as a lightly educated provincial?

In his book "Made in America", Bill Bryson refers to Shakespeare as a "lightly educated provincial" in the sense that he was not formally educated in the traditional sense. Shakespeare's formal education ended at the age of 13 when he was removed from school to help with his father's business. Despite his lack of formal education, Shakespeare went on to become one of the most celebrated writers in the English language. Bryson's use of the term "lightly educated provincial" is not meant to be derogatory, but rather to highlight the fact that Shakespeare's genius was not the result of his formal education, but rather his own natural talent and ability.