Hans Angermeier has produced over 100,000 videos showing drivers how to fix things on their cars. He has broad expertise on basic repair procedures covering the majority of cars on the road.
If your brake fluid is a little low, learn how to add some here. Ignoring a low level leads to big problems
Learning how to jump your car before you need to is an excellent idea
Properly inflated tires is the easiest way to improve fuel economy. The right tire pressure is NOT on the side of your tire btw
Harsh downshifts? Slipping gears? You might be low on transmission fluid