There's hundreds of JRPGs out there of varying quality and ratios of gameplay to story and stuff like that, but if there's one I could recommend to START with I would point towards Tales of Vesperia, which has been recommended here before.
First off Tales of Vesperia is available on pretty much every console under the sun now with the recent Definitive Edition so you can play it portable, PC, whatever. As mentioned before it's an Action RPG and not a particularly complicated one, certainly not much more complicated than some of the more popular action games nowadays. Tales of Vesperia is probably one of the most "balanced" JRPGs I've played, by that I don't necessarily mean encounter balance but in terms of pacing. It has a long story but it doesn't have large hour long chunks of dialogue and meandering between gameplay sessions. What I mean is that you get heavy plot based scenes, interspersed with lighter hearted optional 1-2 minute lone dialogue "skits", with dungeons that are mildly interesting but aren't long enough to overstay their welcome, and a battle system that's fun in short bursts that is presented to you in short bursts. It has alot of modularity too, difficulty can be easily adjusted in a simple menu, there's a lot of party members that play very differently so if you get bored of one character you can immediately make the game interesting again by changing the character you control. It has a story that while isn't the best JRPGs have to offer is above average and it does a great job of getting you invested in the characters as well. It's probably the best entry point into JRPGs that I can think of.
The other Tales of Games are also pretty good entry points though they probably aren't to best start of point. Tales of Berseria, the newest one, probably has the best story of the bunch but the dungeons are utter slogs to get through and the game overstays its welcome in that regards.
Of all the talk about the Persona games they deserve a recommendation for being probably some of the better Turn Based RPGs to get started with. They are heavily unbalanced with their gameplay; you will go like hours and hours without any combat or dungeon gameplay all dialogue and a dating-sim like time management system then spent another hours and hours doing dungeons and combat without any story and so on and so forth, but Persona 5, and any of the modern Persona games (ie 3, 4 and 5) do great jobs of easing you into the relatively complex RPG systems. You can't go wrong with any of the modern Personas if you can stomach the pacing, just be aware that Persona 5 stands out by having like actual dungeons with level design instead of randomly generated corridors like Persona 3 and 4.