To better understand what you can, and shouldn't try to do with a video DVD, it helps to know a little bit about video DVDs themselves. I'm trying to cram an awful lot of info into as few words as possible -- research more, skim, or skip this 1st part as you wish. Do note that whatever the official video DVD spec is, it's an expensive secret covered by a NDA -- everything you read about video DVDs is reverse engineering -- some of what you read will be flat out wrong.
A video DVD is comprised entirely of mpg2 video [even what look like still pictures], combined with usually AC3, but sometimes DTS audio, and subtitles in a graphics format, e.g. they're pictures rather than text, in .VOB files. The mpg2 video can have CC or Teletext embedded. The audio can have Cinavia DRM embedded. The .IFO files contain the scripting & such to make the video DVD work. Mpg2 video uses I frames [key frames] that are complete images -- DVD mpg2 usually has an I frame every 12 - 15 frames.
DVD mpg2 video is normally at broadcast standard [for where you live] frame size, uses non-square pixels, often has a 16:9 aspect that's never been standardized [the actual ratio, compared to standard 4:3, has never been officially defined, so will vary depending on software used] and is always anamorphic. What that means is that the aspect ratio of DVD video has to be altered to display correctly unless you're using a TV with a picture tube. Some software, including players, does that automatically, some does not -- it's up to you to make sure it looks right.
DVD mpg2 video often starts out as 24 fps progressive video for movies, or at 25 fps [PAL] or 29.976 fps [NTSC] interlaced for TV shows. Nowadays don't try to de-interlace -- it causes more problems when current electronics handle the display of interlaced video just fine. When the original video was 24 fps however, you can get rid of the special flags embedded in the mpg2 video that tell the player which frames to repeat to achieve 25 or 29.976 fps. If you're re-encoding that can give you smaller files.
Mpg2 video can be cut edited without recompression -- it can be cut &/or joined at I frames, with the result copied to a new file without recompression. A few apps will allow adding transitions and cutting/joining on any frame, recompressing only those frames that change & are between 2 I frames. A video DVD itself uses a play list to determine which cells [what people usually refer to as chapters] play in what order. It's quite possible to edit that playlist, or create a new DVD from pre-existing video, to effectively cut scenes, commercials etc. The more complicated Angles feature is best left alone -- a DVD can just use multiple play lists, e.g. one with all the chapters for an extended version, or it can use Angles to play alternative streams. You can very rarely change the menu of an existing video DVD -- usually best to create a new DVD using the original resources.
Video DVDs you buy retail normally use several types of DRM. Part of that is trying to break the DVD as much as possible, so Windows won't see it as just removable storage, yet dumb DVD players will still recognize & play it. Part of that is reducing video quality levels -- after all, the folks who demanded quality are buying Blu-ray, if not 4k Blu-ray -- so what you get today will not survive re-encoding without [often Very] noticeable quality loss. Part of that is Cinavia -- when added to the audio track it's near impossible to remove, & detectable by new players. Part of that is made up of the more traditional DRM schemes that decrypting software always tried to bypass. With the exception of DVDFab, and only on a limited selection of titles, there's nothing they can do about Cinavia. And there's nothing any software can do about lower quality video. Some decrypting apps will get fooled once in a while by DVDs that are way off DVD spec.
OK, on to the WinX app & similar...
A DVD decryptor bypasses a video DVD's DRM, as possible, e.g. Cinavia. They'll either copy the entire DVD to hard disk [with WinX the VIDEO_TS option], copy just one of the titles on the DVD to hard disk, or show Windows a disc without DRM, that you can then do whatever with, e.g. copy to hard disk, play etc. Long ago it helped to copy the DVD to hard disk as an ISO file -- no longer... in fact, hasn't been helpful for years. Worse, if that software adds components to work with ISO files, as many [e.g. WinX] do, it's something else that can break Windows, and it sometimes does. That's why I don't have the WinX app installed.
Once a video DVD is on your hard drive you can burn it as-is [I advise using Imgburn], or copy one of the titles, e.g. a movie, to another folder on your hard drive, without some of the subtitle or audio tracks if you wish, trimming off the end credits if you wish. DVD Shrink can do that for you, and also reduce the size of the video files, but you have to be careful -- note that the author of DVD Shrink is said to have taken a job with Nero, & their Recode works in much the same way, especially older versions. If you shrink the size, staying with a percentage in the 90s, Shrink works on the frames in between I frames, so quality loss is minimal. Beyond that you're re-encoding, which at today's quality levels, is not good. If you want to burn a DVD, & the video won't fit on a single layer DVD, simple, use a dual layer blank. It's not rocket science -- people keep asking how to fit a larger DVD onto a smaller disc when all they have to do is buy some dual layer DVD blanks & use Imgburn. Nowadays IMHO the quality loss from re-encoding is just too great.
That said, copying just the movie, optionally trimming off the credits, leaving off audio & sub tracks you don't want or need, and optionally converting AC3 to stereo, the majority of DVDs will probably fit on a single layer disc. Still, all that may be more work than you can easily justify, considering the small extra cost of a dual layer DVD blank. I know there's only so much work I'll go through to save a dollar or two.
If you want a plain mpg2 video file, there are apps for that [videohelp[.]com], or PgcDemux will give you each individual file -- note that the number of apps that can work with mpg2 video without an audio track [.m2v] are limited. Once you have a bare AC3 file however you can do an awful lot more with it, usually at higher quality & with more options that what a ripping app typically offers. You can also convert 5.1 audio to stereo AC3, at roughly 1/4 to 1/3 the file size. Then if you want you can put all the files back together in a new DVD.
Recode will [or used to anyway] take graphics based subs in a DVD in a folder on your hard drive, and embed those in a mpg4 file after re-encoding the video, but compatible players are limited. If you use something like Subtitle Edit OTOH, it can OCR the subs into a .srt text file, which many players will work with. You can also extract CC or Teletxt embedded in the mpg2 video into a .srt text file with ccextractor. If needed, there are also apps that go the other way, converting .srt files to graphics based DVD subs, so you can make a new DVD -- I've heard of parents doing this, along with blanking disturbing audio for their kids.
If you have the individual movie files from a DVD, e.g. having used PgcDemux, you can fairly easily go about putting them together in a new DVD. You can change where the chapters are, or re-use the old ones. You can skip playing any chapter or chapters by editing your finished DVD's playlist with PgcEdit [a new DVD you create will normally have a playlist including every chapter, with no other options]. Or you can use one the Womble apps for example, & cut out portions of the video entirely, without re-encoding. You can also merge episodes from a TV show. And/or come up with your own menus. That said, do be careful about DVD authoring apps -- some will insist on re-encoding what's already DVD spec video, so make sure you can try before you buy.
Most Windows software players will play mpg2 video, fewer will only play a DVDs main title, fewer still will play the complete DVD with menus etc. A licensed software DVD player should recognize Cinavia DRM, so for many people, a mpg2 file together with a .srt file for subs is the best way to store DVDs on their hard drive(s). If you want to use discs rather than fill up hard drives, that's fine too. DVD video is also part of the Blu-ray spec, so you can put 2 - 4 movies on one single layer disc, so less room taken up for storage, but beware that the Blu-rays discs you burn will not have DVD's longevity. Bear in mind that mpg2 is not native to Android -- you may need to use the VLC app for playback if you use a Android device.
Earlier I mentioned aspect ratio -- some people aren't bothered when a player distorts the aspect ratio of the video, some are, and if it matters to you, test 1st to make sure you have a player you can use that understands what the correct aspect ratio should be. Don't wait until after you have copied a dozen DVDs, or worse, re-encoded them, to find out you don't have a good solution in place to watch them.
Finally, some of what I've written here applies to Blu-ray discs too. There are fewer decrypters, the DRM is much more advanced, the video quality is high enough that it can hold up to re-encoding, and the main tool you'll likely use is tsMuxeR. Creating menus is similar to DVDs, usually done with the same software you use for DVDs -- in the many thousands of dollars range, you can't afford the pro software that makes Java-based Blu-ray menus.