MTG Arena is actually pretty good for getting started. Its tutorial modes teach you enough to start playing. There are a lot of interactions that aren't immediately obvious, though, and card/effect wording matters _a lot_.

I can't recommend a good guide because I learned from playing with friends. But an Internet search "how to play magic the gathering" or a YouTube search for the same thing should give you a lot of lot of guides to choose from.

If you have a local game store going in and asking if they have any resources for new players hoping to learn how to play would probably be the best option, imo.

Boardgames are social thing. Magic is the best when there is a gathering.