TITLE: learning Deligne-Lusztig theory
QUESTION [15 upvotes]: Can someone give me a roadmap for learning Deligne-Lusztig theory? (Except for the original article by Deligne and Lusztig)
Edit: You may assume knowledge of representation theory of finite groups (as in Serre), algebraic groups and étale cohomology.

REPLY [4 votes]: As far as I've experienced, having a good pre-image and overview of the topic you are going to learn is so much helpful.It helps you to make a general skeleton of the theory in your mind, so you will be able to put the new technical details in their right positions in the process of learning.   So I think beside the brilliant learning roadmap which Jay Taylor mentioned above, you can watch the two-part lecture of Cedric Bonnafe, Introduction to Deligne-Lusztig Theory, to get a nice overview of the theory. The lecture was delivered at the MSRI Introductory Workshop on Representation Theory of Finite Groups and the videos are available in the website.