Understanding yourself in different dimensions would be at the top of my list. It takes a lifetime to do it well though. Learn to cook and prepare food, especi

Understanding yourself in different dimensions would be at the top of my list. It takes a lifetime to do it well though. Learn to cook and prepare food, especially your favorite foods. Then you can make better decisions when buying packaged food, when eating out and also not be dependent on someone or some establishment for something as basic as food (of course, you can take this further and get into gardening and such, but just start with cooking from ingredients you can buy). Listen to people without interrupting and trying to solve their problems. Listening is a gift to others and to yourself. Learn to write better, since we (the readers and writers here) depend on written communication a lot more than people from the last century and before. Learn to manage expenses, followed by learning to manage investments (start by understanding the power of compounding). IMO, playing an instrument and learning a sport are hobbies, not necessarily life skills.