If you are talking about how to transfer the Files of Video and Audio from a DVD to your computer, what you can do is put the DVD on your computer bin, then open the folder of this DVD. this is going to provide you an AUDIO_ST and VIDEO_ST folders, that you need to copy and paste into your computer. That's how you can save the files on your computer.
The other option would be using the Prism Program from NCH that is going to convert and save the files into your computer. You can try the Free Trial on the next link https://www.nchsoftware.com/prism/prismsetup.exe