No free lunch theorem

The "No Free Lunch Theorem" says that there's no magic way to solve every problem ever. It's like trying to eat every flavor of ice cream at once and expecting it to taste good - it's just not possible. Math and computer problems work the same way - some problems need different ways to solve them, and there's no one perfect way to solve all of them. Sometimes you have to try different ways to see which one works best, and that's okay! It's like playing with a toy and trying different ways to fit the pieces together until it looks right. So don't worry if you don't have a perfect solution to a problem right away - just keep trying different approaches until you find one that works for you.