i personally use
MakeMKV. its free as long as in beta which is ermm always,
here is the key which you need to check and enter about once a month or so, so bookmark the page.
as long as your copying DVD then your files will be around 4gb so to save on internal storage space you would use a micro/usb card.
MakeMKV copies 1-1 so if you want the file smaller then you'll need to use handbreak or something to shrink it.
pretty much everything plays .mkv files.
i can help you through all the steps if you like. its easy.