>>14144814The prerequisite to category theory is having a wide background in math.
Like being familiar with set theory, linear algebra, analysis, topology, abstract algebra, etc.
The reason for that is that category theory looks at all of these at the same time abstractly.
In set theory, you deal with sets and functions between them. In linear algebra, you deal with vector spaces and linear transformations. In topology, you deal with topological spaces and continuous maps. In abstract algebra, you deal with algebraic structures and homomorphisms.
All of these can be thought of as studying objects (spaces/structures) and arrows between them (maps).
Category theory arose from algebraic topology, by looking at common concepts and abstracting them, so you may also consider algebraic topology to specifically be a prerequisite.