So I've realized over the past three years that this has the potential to really change the world and I'd really like to be a contributor. I have a background in economics and enjoy programming for fun. I'm therefore going to undertake a year long course on Computer Science to improve my general technical expertise. In the future I would like to build stuff on top of Bitcoin. So with this in mind, which of these subjects be the most ideal to focus on? (I can pick around 7)

• Computer Architecture
  
  Computer Security
  
  Concurrency and Multi-Core Architectures
  
  Constraint Programming
  
  Distributed Systems
  
  Principles of Computer Communication Systems
  
  Software Architecture
  
  Software Engineering
  
  Web Technologies
  
  Machine Learning
  
  Critical Systems Engineering
  
  Database Management Systems