There are different ways to prevent oxidation for different things. For example if you want you cut apple not to go brown and shrivel up then you can put it in lemon juice ( I don’t think you’ll want to eat it afterwards so it’s not too useful). For metal there are a few ways one really easy one is to not let your car come in contact with moisture, did you know that iron needs 40% humidity before it starts to rust there are a lot of different paints you can use as well the most commonly used for cars is polyurethane.