Cooking! You don't need to be a Michelin-star chef (or even aspire to be) but if you can make your own meals regularly you can save so much money. It's a great way to bond with your kids, too!
Also, maybe it's weird to say, but 'learning' is an incredibly valuable skill that Will see you through a lot of hardship. The ability and drive to continue learning and having curiosity late into life makes people healthier, happier, and more well-rounded persons in my opinion.