I'm not particularly interested in actually doing automated trading, but I do read this section of ET and haven't seen anyone ask this question. If you were just starting out today, what would you have done differently? Are there any lessons that aspiring programmatic traders can learn that you wish you had when you were younger and less wise? Whether it's the languages you wish you had focused on, to the methods you should have used to find strategies, to which vendors don't waste your time and provide the best bang for the buck, it all goes. Divulge as little or as much as you want. IMO, it's all useful info that a lot of the readers of this forum would benefit from.