Its difficult to have that learn of other mistakes. At first, do we need to find other traders faulty strategy or their experience. I think its really can save much time and energy if we will going to investigate our own bad habits rather than others which we don't have much idea how to begin.
You can certainly do better to learn from your own mistakes as you will also remember them much more than someone else's because you experienced the loss. You can learn from others in the form of advice to keep in mind while trading so that you can become a better trader.