You will need to buy a DVD Ripper programme that will convert the DVD to a format like mp4, mate uses one called DVD Fab, he bought it after trying the free version...
https://www.dvdfab.cn/ less complicated than my way....
Once upon a time there was a great little prog called DVD Decrypter which would crack the code on the DVD and allow you to copy it to another DVD or HDD..... still available I believe
http://www.dvddecrypter.org.uk/ ...........I use Nero as well ...................................You need to convert the DVD format to mp4 or AVI though as most DVDs will be in the vicinity of 7gb, takes up far too much space, converting to mp4/AVI makes it smaller, you pick the size , compress it too much you get a lousy copy so you experiment usually 2.5-3gb gives a good copy then you fiddle around with the sound so you have a good quality and good volume on the sound, once you get it right your good to go....
Your computer will need a DVD reader or a portable to plug in with plenty of space on the HDD for it to operate, the flash drives need to be 32gb so it can hold quite a few movies, putting them onto say a large portable HDD can be problematic as not all TVs will read them, hence all my movies are on a 1tb portable which I will transfer a selection to a flash drive for viewing.....
mp4 or AVI are good all round formats to use as they produce good quality video and sound and will play on pretty well every device, most of my stuff is in AVI format.... Its the same with music CDs they are in a CDA format best to turn it into mp3 then you can fit numerous CDs onto one DVD in mp3 or millions of songs onto a flash drive.............
In the Jeep I have a SD card full of music which lives in the SD slot even better than using a USB drive as its out of the way....