Honestly, I’d say Chrono Trigger. Not only is it universally acknowledged as one of the best examples of the genre, but it isn’t too difficult, and has lots of in-game tutorials for how game mechanics work. It also has lots of replay value. I’d recommend the DS version. Super Mario RPG is also good along the lines of…

Since you say you have a Switch I’d say jump on Octopath Traveler, despite the one small issue of characters not really featuring in each other’s stories most of the time, it’s damn great and pretty easy for a newbie to get into because it explains how things work...