You have domaining blogs, forums… you name it.
All sorts of places through which people share their thoughts, success stories but also mistakes.
Negotiation mistakes, acquisition mistakes and so on.
One of the most important qualities I have is precisely this: the ability to learn from the mistakes others made as opposed to only learning when I screw up myself.
Your mistakes might be the most valuable learning experiences but always keep in mind that they’re the most expensive ones as well 🙂