Use OEM transmission fluid. VERY important to use the right fluid for your vehicle.

Best to avoid carguru website. Usual tricks and very few non-dealer sellers.

Never tow on wheels that drive the car. If all wheel drive, use flatbed to tow. In general, it's always safer to use flatbed for towing.

When parking on a hill, apply emergency brake before shifting to park. This puts the force that prevents the car from rolling down the hill on the brake and not the transmission.

Recent Optima batteries are made in Mexico, not U.S., and quality dropped (while price increased). Avoid Optima batteries.

AC Pro Super Seal recommended by Scotty for small AC leaks.

Ethanol is common additive, but should not be more than 10% or can damage the engine. You can buy a device to measure ethanol content.

When jump starting car, let the running good car charge the dead car for 10 minutes, then turn OFF the running car, then try to start the dead car. Don't keep the good car running while you try to start the dead car--that could mess up computers, etc.

According to @Scottymechanic, Aisin, a company owned by Toyota, makes the best transmissions (NOT including CVTs).

USB adapters for your car are more complicated than they look, and cheap ones can cause unexpected problems.

Too much ethanol.

Transmission problems, unless you buy a stick. Four-cylinder engines are more reliable than their six-cylinder engines.