The most useful thing has been learning about myself. Second best are the strategies I was taught to "reframe thinking patterns" My PDOC gave me a book about it back around 1994. It sounds very similar to the newer DBT and CBT therapies I've read about. It was EXTREMELY helpful and good for all around living. I've taught these techniques to others over the years and it's helped them. I can't imagine what my life would have been without learning these techniques. Learning to look at things from all angles is very helpful