Basic foundations of personal finance.
You don’t need to suck on the hose if you want to siphon gas.
CPR you might save someone’s life with it
How to use the sort and filter functions on Excel. These functions can help prevent a lot of future pain
It probably won’t take that little time, but you can learn to manually mentally release the muscles in your head that cause tension headaches.
Good luck figuring it out because finding the method is hard due to the fact that you have to make an effort to stop the muscles’ efforts; so you have to apply a sense of letting go like a clenched fist relaxing to the muscles.
When you start to get it, therw is a feeling of relief, and like the back top of your throat behind where yout tongue can touch relaxes and lowers a bit.
It helps a lot, once you can notice and let got of those headaches, and it helps with fever headaches, but you have to constantly maintain focus to keep them relaxed so the pain from the heightened blood pressure(due to imflammation) is cut in half.