I’m no expert in converting DVDs, but I might start with a program called MakeMKV, which used to be free. The files it produces from DVDs can be pretty big, so I’d then use another program called HandBrake to convert them to a more manageable and compatible size and format.
Others may chime in with simpler options. That’s just what I’ve done.
Entering the world of 4k is another animal. There’s a guide running around here that was recently assembled which showcases many of the difficulties:
Honestly, I’d avoid it for a bit until you can learn more about the system and what it can do. 4k is just a big hairy mess because there’s not a standard way to approach it yet.
