Don't buy used car with non-functional A/C (if A/C is important to you). A/Cs can be expensive to fix. Scotty talks about the old Toyota Vans like I had. He liked them. They stopped making them because they were expensive to build :(

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

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.

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

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.

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

Too much ethanol.