Introduction to subfactor theory

Question

I have almost no knowledge about subfactor theory but I would like to understand what it is. As a self-learner, I do not know where to start. Could you suggest introductory text/paper/book to study subfactor theory.

By a subfactor theory, I mean something related to planar algebra, fusion categories, knot invariant.

I have some basic knowledge about fusion categories but never studied planar algebra.

Answer 1

http://arxiv.org/abs/math/9909027 is Planar Algebras I by Jones.