Awakening is the first FE game I played, and it felt very beginner friendly overall, with natural difficulty rise, so I definitely recommend that one.
I think Blazing Sword on GBA is also a good one, but I never finished it, so I have no idea how much the difficulty ramps.
"Just for comparison Uncharted 4 was 20x bigger than Splatoon 2. This shows the huge difference between Sony's first-party games and Nintendo's first-party games."