Arcane School

Many arcane spellcasters delve deeply into a single school
of magic in an attempt to master its secrets. If you want to
be a specialist wizard, choose a school in which to specialize.

You gain additional spells and spell slots for spells of your
school. Arcane schools are described in detail on page 207.

If you don’t choose a school, you’re a universalist, a
wizard who believes that the path to true knowledge of
magic requires a multidisciplinary understanding of all
eight schools working together. Though a universalist lacks
the focus of a specialist wizard, they have greater flexibility.
Universalist wizards are described on page 209.