Never forget your windshield wipers. If your windshield wipers are causing streaks or making noises, they may need to be replaced. You should replace them annually, but you may have to do it twice a year if you are in a rainy area.
It can be dangerous to repair vehicles on your own. Make sure someone is nearby to help if things go wrong. Buy good quality tools so they won't break when you use them. Nowhere is this more applicable than with the items you use to change a tire. A good quality jack is very important, especially since you will be under the vehicle. This is why it is wise for you to use quality hydraulic floor plugs and jack stands.
You should not attempt to diagnose complex problems. Cars are complex and it takes experience to fix them. What may seem like a simple task can be very complex, especially in newer electric cars and also new computerized vehicles. Let an auto repair shop diagnose the problem. Tell them as much as you can about the problem, but let them determine the cause.