The world has changed a lot and will continue to change quickly. What is something that you think should be taught in high school, either because you wished you could have learned it, or because you want your children to get the best education.
I'll start by saying that I wish that they taught more life skills. How to you register to vote in your state? How do you do taxes? How to you open a retirement savings account? What are the different retirement savings accounts? How do you buy a house?
What basic cooking skills do I need? How to be handy around the house would be nice too.
I know that now we have Youtube and the internet and anything we want to learn we can, but sometimes it's nice to have a teacher teach you in a classroom setting while you are young.
Other things that might be a good idea but it might not apply to everyone would be a typing class (most kids know how to do this), coding class, computer software class, etc.