The aim of this seminar is to understand the notion of θ-positivity and how it relates to Higher Teichmüller theory. θ-positivity is a notion of positivity in semisimple Lie groups and was recently introduced by Guichard and Wienhard as a generalization of Lusztig's total positivity. The workshop is aimed at graduate students in the held and no previous knowledge is assumed. Some familiarity with Lie groups or representations of surface groups is helpful, but not necessary. Every participant will play an active role in the seminar -either by preparing a talk, or by organising an exercise session to consolidate what we have learned.