MakeMKV is fairly simple to use. There are three different modes. You can open files or an ISO on the hard drive. Or you can open a disc in your optical drive. Either of those options will give you an MKV file as output, with no compression and no change of video or audio codecs used. It just decrypts if necessary and repackages the main movie into an MKV.
The third option is to use Backup mode. You get to this by clicking File–>Backup. Backup mode only works with Blu-ray discs, not DVD’s. In Backup mode, MakeMKV decrypts the Blu-ray movie and copies the entire thing to the hard drive in Blu-ray format.
The author has added a few things over time, including the ability to select individual titles in a DVD as the input, rather than the whole DVD. This can be handy for TV series discs. To do this, you import the DVD, then put a check mark in the titles you want…they’ll show up in the main window. Then click on File–>Save Selected Titles.
If you have any other questions about using it, feel free to ask. The program will give warnings about a limited time to use it, but while it is in beta you will always be able to download a new beta key from their forum (there are links in the updates I make) or you will have to download the newest version of the program as those updates are released. In any case, even if the program moves out of beta status, the author says it will always be free to use for DVD decryption. Blu-ray decryption will not be free if a full, non-beta version is released.