Imgburn Google it. It's free program. Will make an ISO of a dvd which can then be burnt to a blank DVD using same software bedt way if you only have 1 dvd writer. or even if you have 2 DVDs drives you can use it to copy one to the other
Handbrake is the best program out there for this. Exports them as a video format of your choosing. Totally free. https://handbrake.fr/