Important knowledge is how you stay, even if you are far from a book, school, or screen. If there's no one else, it helps them make decisions. It's not just facts, data, or theory - it's about wisdom. I know how to treat people correctly, how to survive when things fall apart, how to calm down when the world is noisy. The important knowledge is knowing when to speak, when to listen, when to fight, and when to leave. It's a lesson that comes from failure rather than success - a way that you won't forget because they left a trace.
Sometimes, the most oldest, mistakes, errors, calm and observed important knowledge of unexpected places. It's not always written in books. Sometimes it hides in a story, in scars, in quiet ways. It's about knowing how to raise a child, how to comfort a dying person, and how to make something with your hands. It's what you can't see for everyone to argue, and this closeness costs no more than anything. In a large, informative world, necessary knowledge is something scarce. It's a filters that help you make conclusion on what to keep and what you don't need to keep. It will help you to know who you are, what you appreciate and what life you want to live. And perhaps the most important knowledge about everyone is that they will not stop learning. Life itself is a teacher, and every day is a class.